Prep Hub
Free interactive lessons, diagnostics and practice tests to help you find your gaps, learn the skills behind them, and prepare with purpose.
Meet Io (EYE-oh), your Prep Hub guide. A university student who took these exams not long ago, Io walks you through every lesson, one step at a time.
Find the gap before you fix it.
Interactive lessons, diagnostic tests, focused topic drills and full practice tests. SAT Math is live now, and every subject below will follow the same format. Everything is free to start, with no registration needed.
SAT Math
Algebra, advanced math, problem-solving and data analysis, and geometry: all four College Board domains, 19 skills and four difficulty levels, with Desmos calculator support.
SAT Reading & Writing
Digital SAT evidence-based reading, grammar, rhetoric, and expression of ideas across Information and Ideas, Craft and Structure, and Standard English.
AP Sciences
AP Biology, AP Chemistry, and AP Physics: lessons, diagnostic tests and topic drills aligned to College Board AP frameworks and exam weighting.
AP Mathematics
AP Calculus BC, AP Statistics, and AP Precalculus, covering theorems, methods, and problem types across all major topic areas and exam formats.
IB Mathematics
Analysis and Approaches and Applications and Interpretation: both course tracks at Standard and Higher Level, built to the IB syllabus.
IB Sciences
IB Biology, IB Chemistry, and IB Physics, with content structured around IB assessment objectives, command terms, and internal assessment skills.
A-Level Sciences & Maths
Cambridge and international boards: Mathematics, Further Mathematics, Physics, Chemistry, and Biology at AS and A-Level.
Economics & Business
IB Economics, AP Economics, A-Level Economics, and IGCSE Business, covering micro, macro, and quantitative content across all major curricula.
Looking for a subject not listed? AperioHub Connect covers a wide range of curricula through one-to-one subject tutoring. Explore Subject Tutoring or contact us to confirm availability for your subject.
Diagnose. Learn. Drill. Test.
Four modes, each with a different purpose. Start with the Diagnostic if you are not sure where your gaps are, learn the skills behind them, use Drills to close them, and take the Full Test to confirm.
A structured test that maps your performance across all topic domains in one sitting. It is calibrated to identify your strongest areas, your weakest sub-skills, and where to focus first. Results are instant and include a full insight report.
One interactive lesson for each skill. Explore ideas with graphs and sliders, follow worked examples, practise with instant feedback, and finish with a short challenge. Io guides you through, and your progress is saved as you go.
Focused sets targeting one sub-skill at a time. Each question includes a detailed explanation immediately after you answer, so you understand the method, not just the result. Use Drills to build confidence in a specific area before retaking the Diagnostic.
A full timed practice test replicating real exam conditions: strict countdown, no per-question feedback during the test. Pacing, flagging, and revisit patterns are tracked throughout. A complete insight report is ready as soon as you finish.
Lessons, the Diagnostic and Topic Drills are free with no registration. The Full Practice Test offers optional registration to save your results.
Does taking practice tests actually improve scores?
In study after study, students who tested themselves on material, rather than re-reading it, remembered significantly more, for longer. The research is consistent: active recall through testing is one of the most effective learning techniques available, more effective than highlighting, summarising, or reviewing notes.
Most students study what they already know. It feels productive but targets the wrong areas. A diagnostic changes that. It gives you a precise picture of where your score is actually being lost before you spend time on content. Targeted practice on real gaps is more effective than broad revision.
Beyond right and wrong, our tests track time spent per question, flagging patterns, and revisit behaviour. This tells the insight report whether a wrong answer reflects a knowledge gap or a pacing and confidence pattern: two very different problems with different solutions.
Roediger, H.L. and Karpicke, J.D. (2006). "Test-Enhanced Learning: Taking Memory Tests Improves Long-Term Retention." Psychological Science, 17(3), 249-255. One of the most replicated findings in cognitive psychology: retrieval practice produces stronger long-term retention than equivalent time spent re-studying.
A single diagnostic maps your performance across every domain, giving you a starting point that hours of unguided study cannot provide.
Pacing and flagging patterns are tracked silently. The insight report distinguishes between a knowledge gap and a time management pattern, because the fix is different for each.
Every report identifies a priority area and suggests what to do next: a lesson, a topic drill, a revision focus, or a session with an AperioHub subject tutor if the gap needs hands-on work.
AperioHub has run structured experiential learning programs for 365+ university students across 23+ countries since January 2026. The same outcome-focused, diagnostic-first philosophy shapes every tool we build on this platform.
When you know the gap, we know the tutor.
AperioHub Connect pairs students with subject tutors from Ivy League and leading US universities, one session at a time, no upfront package required.