Join 650k+ students breezing through the IBReady to breeze through the IB?
For M28 students: IB exams in May 2028, started DP1 in August 2026.
Yes, joining IB Physics late in DP1 is manageable if you identify what your class has covered and begin a focused catch-up plan. A few missed weeks rarely make the subject impossible, but gaps in mathematical methods, mechanics and practical skills can cause continuing difficulties.
This guide explains what to prioritise, how to address missed practical work, and how to catch up in four weeks without neglecting current lessons.
Find out what you have actually missed
There is no universal first unit in IB Physics. The current course has five broad themes, but schools teach them in different sequences. Your class might begin with mechanics, thermal physics, waves or measurement.
Ask your teacher for:
The exact syllabus sections already taught
Lesson materials and assigned textbook pages
Completed tests or quizzes
Details of missed practical activities
The current topic and next assessment date
Confirmation of your SL or HL placement
Match this list to the current IB Physics resources for SL and HL. Resources for the previous syllabus may use a different structure and assessment format, so check before relying on them.
Prioritise transferable foundations
Your first task is not copying every missed page. It is learning the ideas and methods that later topics depend on.
Mathematics and data handling
Practise rearranging equations, substituting values with units, scientific notation and graph interpretation. Understand scalars and vectors, including resolving vectors into components when required.
Focus on:
Unit conversions and prefixes
Significant figures versus decimal places
Graph gradients and intercepts
Proportional relationships
Trigonometry and basic algebra
Recording measurement uncertainty
For example, rearranging gives . Practise rearrangement before substituting numbers: IB questions assess your ability to select and apply relationships, not simply recall them.
min read
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v=u+at
a=(v−u)/t
Mechanics, if your class started with Theme A
If your class began with space, time and motion, prioritise displacement, velocity, acceleration, forces, momentum, energy and power.
Connect each relationship to its physical meaning:
Displacement-time gradient represents velocity.
Velocity-time gradient represents acceleration.
Area under a velocity-time graph represents displacement.
Resultant force produces acceleration according to F=ma.
Work transfers energy; power measures its transfer rate.
Momentum is conserved in an isolated system.
For every equation, identify the variables, units and conditions under which it applies. This prevents formula selection from becoming guesswork.
Experimental thinking
You must also identify variables, describe reproducible methods, process measurements and evaluate limitations. Ask how your school expects tables, graphs, uncertainties and conclusions to be presented. Review permitted class data, but never copy another student's analysis.
What can wait
During the first four weeks, you can usually postpone choosing a final scientific investigation question, studying future themes and attempting full examination papers. Avoid starting HL extensions before mastering their prerequisites.
Rewriting every lesson neatly is also unnecessary. Concise summaries are sufficient: your immediate goal is to rejoin the class, not reconstruct a perfect notebook. The guide to the first term of IB Physics offers additional context for early expectations.
Address missed practical work
The current course recommends 150 teaching hours at SL and 240 at HL. The internally assessed scientific investigation contributes 20% of the final grade at both levels.
Early DP1 entrants are unlikely to have missed the final investigation itself, although scheduling varies. Missed introductory practicals still matter because they develop measurement, graphing and evaluation skills.
Ask your teacher to classify each missed activity:
Missed activity
Appropriate response
Safety or equipment training
Complete it under teacher supervision
Foundational measurement activity
Repeat where feasible or analyse teacher-provided data
Content demonstration
Review its method, observations and underlying model
Do not independently recreate experiments involving electrical, thermal, mechanical or other hazards. Your teacher determines what must be repeated and what supervised access is available.
Also check for missed work connected with the collaborative sciences project. Your teacher and IB coordinator are the authoritative sources for local requirements and deadlines.
A four-week IB Physics catch-up plan
Allow approximately 30-45 minutes on five days each week, plus a longer weekend session. This is a starting recommendation, not an IB requirement; adjust it with your teacher for longer absences or HL demands.
Week
Main purpose
Specific actions
1
Diagnose gaps
Obtain the taught-content list, complete a diagnostic, review units and algebra, and study the first missed subtopic.
2
Recover core content
Study one concept daily, create a relationship map and attempt basic questions without notes.
Complete a timed topic set, correct errors and revisit weak concepts before the next assessment.
Use a traffic-light audit after each session:
Green: you can explain the model and solve an unfamiliar question independently.
Amber: you understand the notes but need prompts.
Red: you cannot explain the concept or choose a relationship.
Prioritise red areas, then amber ones. Keep green topics active through spaced review rather than repeated rereading.
Study each topic efficiently
Use a learn-practise-correct cycle. Read a concise explanation, close it, reconstruct the model from memory and attempt focused questions.
The IB Physics Questionbank supports topic-specific practice. Start with straightforward applications before unfamiliar contexts and multi-step problems. If your HL class has reached rotation, use the rigid body mechanics resources after recovering prerequisite linear mechanics.
Keep an error log recording the topic, mistake, correct reasoning and follow-up date. Distinguish conceptual errors from algebra, units and misreading so you address the actual weakness. For longer-term planning, consult the realistic IB Physics study plan.
Decide between SL and HL using evidence
A late start alone should not rule out HL. Consider university requirements, mathematical confidence, missed content and your overall Diploma Programme workload.
HL adds content, depth and recommended teaching time. Ask for a teacher-set diagnostic rather than relying only on previous science grades. Confirm your school's level-change deadline with the coordinator.
If permitted, try two weeks of catch-up while attending your intended level. Review your understanding, accuracy and time demands with your teacher before deciding.
Avoid the mistakes that prolong catch-up
Do not substitute long cramming sessions for regular application. Avoid reading solutions before attempting questions, ignoring units and vector directions, or hiding confusion because classmates seem ahead.
Most importantly, continue learning the current topic. Divide your study time between live lessons and missed material so the gap stops expanding. Ask specific questions, such as why a force is absent from a diagram, rather than saying you understand nothing.
Conclusion
Joining IB Physics late in DP1 is realistic when you identify the precise gap, strengthen transferable foundations and coordinate practical catch-up with your teacher. Measure progress through independent problem-solving, not pages read.
RevisionDojo can support that process while your teacher guides sequencing and practical arrangements. Start with the relevant Study Notes, then test your understanding through targeted Questionbank practice.
