IB DP Final 90 Days: The Best Order to Revise Subjects

IB DP Final 90 Days: How to Turn Panic into a Plan

Take a deep breath. Ninety days sounds like a lot, and it’s also not infinite — but used well it’s enough to change exam outcomes. If you’ve been dithering between textbooks, messy notes, and a backlog of practice papers, this post is your practical navigator. I’ll walk you through why order matters, the principles that should decide what you study first, and a concrete, day-by-day framework you can adapt to your subjects and strengths.

This is written for real students doing real things: juggling school, deadlines, extracurriculars, and the occasional existential thought at midnight. The goal is clarity, not complexity. By the end, you’ll have a clear order of attack for your subjects, a three-phase calendar you can paste on a wall, and practical tips to convert study hours into scores.

Why the Order You Revise Actually Changes Results

Revision order isn’t just about preference. It’s a tactical choice that affects memory consolidation, morale, and how quickly you close knowledge gaps that cost marks on exam day. Think of the last 90 days as triage: some things need immediate surgery, others need ongoing therapy, and a few benefit most from last-minute polishing.

• Urgency: Any outstanding assessments (internal assessments, samples, or core tasks) must be prioritised — they often carry deadlines and fixed weightings.
• Return on investment: Weak HL topics yield more score improvement per hour than polishing already-strong SL content.
• Timing of practice: Skills like essay-writing, lab reports, and structured problem solving improve most when spaced with feedback and timed practice.
• Emotional momentum: Mixing a high-demand session with a confidence-boosting topic keeps motivation steady.

Principles to Decide the Order — A Quick Checklist

Apply these principles like a filter when you build each week’s plan.

1. Take care of the core and deadlines first

If you still have an Extended Essay draft, unfinished Internal Assessments, or outstanding TOK artifacts, slot those into the earliest weeks. Completing these reduces cognitive load and removes non-exam variables that can derail revision later.

2. Prioritise HL weaknesses

HL subjects carry more content and have deeper question demands. In most cases you’ll gain more points per hour by shoring up a weak HL topic early than by squeezing extra marks from a strong SL.

3. Balance breadth and depth

Rotate subjects so you don’t burn out on one topic. A good rule: daily focus on one major subject (often an HL), plus a review block for a second subject or skills practice.

4. Attack high-yield topics early

Topics that appear across papers or underpin many other topics deserve early attention — examples include key concepts in mathematics, core experiments in sciences, or literary techniques in language courses.

5. Use spaced repetition and active recall

Backload memorisation to shorter, intense sessions and use early weeks for understanding. Schedule multiple short reviews rather than one long marathon.

A Practical 90-Day Blueprint — Three Phases

Break the 90 days into three digestible phases. Each phase has a different objective: build, broaden, and polish. Below is a compact table you can print and stick on your wall.

How to Choose the Exact Order for Your Subjects

Use a three-factor rule to decide which subject goes first on any given day: Deadline risk, score impact, and current confidence. Translate that into a concrete order like the example below — remember this is a template, not a mandate.

• Immediate deadlines: Any subject with a looming IA or submission belongs at the top until it’s done.
• High-impact weakness: Pick the HL subject where you’re losing the most marks and give it the deepest block in Phase 1.
• Confidence rotation: Pair a heavy HL session with a lighter SL or skills session (e.g., languages or maths practice).

Example weekly rotation for a student with three HLs and three SLs:

• Monday: HL 1 deep focus (concepts & problem sets) + SL A quick review
• Tuesday: HL 2 timed questions + language practice
• Wednesday: HL 3 lab/essay skills + SL B targeted questions
• Thursday: Mixed past paper (two subjects) + error log review
• Friday: EE/TOK touch-up or catch-up + light review
• Weekend: Long mock (alternate full past papers each week) and review

Daily Study Structure — Make Every Hour Count

Not all hours are equal. Rearrange tasks to match your mental energy. Use this simple block model and adapt the lengths to match school hours and other commitments.

• Warm-up (15–30 minutes): quick recall of last session’s notes or flashcards.
• Deep work (60–90 minutes): focused subject block on your day’s main priority.
• Active practice (30–60 minutes): past-paper questions or essay drafts.
• Feedback & correction (30 minutes): mark, annotate, and transfer errors to an error log.
• Light consolidation (20–40 minutes): concept mapping or spaced repetition flashcards.

How to Use Past Papers So They Pay Off

Past papers are not just practise — they’re a training ground for exam thinking. Here’s a simple cycle that turns a past paper into measurable progress:

• Time it. Sit under timed conditions for authenticity.
• Mark it honestly (use markschemes if possible).
• Annotate: identify command terms you missed, question structure clues, and recurring errors.
• Create a micro-plan: three short drills to fix the one recurring mistake.
• Repeat the same paper or topic in two weeks to check for real learning.

Common past-paper mistakes and how to fix them

• Misreading command terms — Drill the command terms list until your responses match the verbs.
• Poor time allocation — practise paper sections in timed chunks, then simulate a full exam once a week.
• Weak mark justification — build answer “skeletons” for common question types (definition, evaluation, compare, calculate).

Sample Timings: How to Split Your Weekly Hours

Here’s a flexible rule-of-thumb that many students find useful. Adjust absolute hours to your life, but preserve relative weights.

Quick, Practical Tools to Speed Up Progress

• Error Log: Keep a one-page list of mistakes per subject and revisit it twice weekly.
• Highlighted Markscheme Notes: Copy short examiner phrases that earn marks and practise using them in answers.
• Mini-mocks: 45–75 minute targeted mocks on a topic instead of full papers every day.
• Peer swap: Swap an essay or lab report with a classmate for fresh feedback — but use a rubric.
• Targeted help: For those stubborn topics, a short focused session with an expert tutor can convert confusion into clarity quickly — try Sparkl for one-on-one guidance and tailored study plans.

Study Techniques That Actually Work

Avoid passive rereading. Use these active methods because they map directly onto how examiners award marks.

• Active recall: Close the book and write the answer from memory. Then check and correct.
• Interleaving: Mix subjects in a session rather than doing long single-subject marathons.
• Feynman technique: Teach a topic aloud to a friend or record yourself — teaching exposes gaps fast.
• Exam-style outlines: For essays and labs, practise structured outlines under time pressure.

When to Ask for Extra Help (and How to Make It Targeted)

There’s a big difference between general tutoring and targeted intervention. Book help when:

• You have a recurring error that remains after three practice cycles.
• Exam technique — timing, command terms, structuring answers — repeatedly costs you marks.
• You need an external, exam-focused mock with realistic marking and feedback.

A focused session should finish with a tiny, actionable to-do list. If you choose a tutoring platform, look for short, targeted sessions with exam-aware tutors and personalised follow-up drills — for instance, Sparkl’s tailored study plans and AI-driven insights can be used to create that structured follow-up without bloat.

Emotional Fitness and Study Rhythm

Revision is a marathon of focus, resilience, and self-awareness. Keep these non-negotiables in your plan:

• Sleep: Aim for consistent sleep blocks; cramming at the cost of rest is counterproductive.
• Micro-breaks: 5–10 minutes every 60–90 minutes to reset attention.
• Movement: Short walks or light exercise help consolidate learning and reduce stress.
• Progress tracking: Weekly mini-reviews so you see improvement — this fuels motivation.

Sample Micro-Roadmap for a Student (Concrete Example)

This example assumes three HLs and three SLs, with a partially completed EE and no missing IAs. Tweak it to match your situation.

• Days 90–80: Finish remaining EE draft tasks and any outstanding IAs. HL weakest topic — concept maps and problem sets. Light SL rotations for confidence.
• Days 79–60: Build breadth across HLs with weekly timed sections; begin full-paper practice once every 10 days. Keep EE revisions on low-frequency schedule.
• Days 59–40: Increase frequency of timed full and half papers. Identify common mistakes from markschemes; create micro-drills for those errors.
• Days 39–20: Simulate exam weeks with multiple full papers and strict timing; finalise EE and TOK reflections if needed.
• Days 19–1: Flashcard blitz, formula sheets, quick past-paper corrections, and short timed answers. Mostly active recall and markscheme-aligned responses.

What to Avoid

• All-night binges the week before exams — they erode retention and clarity.
• Studying without feedback — practise + feedback is where marks grow.
• Fixating on low-yield trivia instead of common, mark-bearing skills.

Final Practical Checklist — Use This Weekly

• Have I completed any outstanding submissions or drafts? If not, schedule them first.
• Which HL topic cost me the most marks this week? Schedule a deep block for it next week.
• Have I done a timed paper this week? If not, schedule one this weekend and mark it honestly.
• Is my error log updated and are the same mistakes appearing? If yes, book a targeted help session.
• Am I sleeping, moving, and taking breaks? If not, reduce study hours quality-over-quantity.

Parting Thought (A Short, Firm Conclusion)

Order your revision by urgency, impact, and confidence — clear critical deadlines first, then attack HL weaknesses, broaden with mixed practice, and finish with focused exam rehearsal. Use targeted tools and short expert sessions where they remove confusion fastest, and keep recovery non-negotiable. The last 90 days are about smart choices, steady momentum, and converting practice into reliable performance.