Free Study Help by Subject

What's on these pages

Each subject page has three parts. First, an honest read on where that specific course loses people — not study advice in general, but the particular step where grades break: stoichiometry in chemistry, the algebra underneath the calculus, the gap between recognising and recalling in biology. Knowing the failure mode is most of the fix, because it tells you what to study rather than how hard.

Second, free resources with a note on when to use each one. There is no shortage of free material online; there is a shortage of judgement about which kind helps at which stage. A full lecture series is the right answer when you missed three weeks and the wrong answer when you are stuck on one homework problem at midnight. The notes say which is which.

Third, three plans by time remaining — the rest of the term, a week, or tonight. These are genuinely different strategies, and the most common mistake in finals week is running the term-length plan with four days left.

Everything here is free, and that is the whole filter

Every resource listed is free to access without payment: Khan Academy, OpenStax's open textbooks, MIT OpenCourseWare, Harvard's CS50, Yale Open Courses, the Purdue OWL, and a small number of YouTube channels that are genuinely better than the alternatives. Nothing here is a paid tutoring service, nothing is an affiliate link, and nothing is listed because someone asked us to list it. Links open in a new tab and we get nothing if you click them.

Two free resources are not listed per subject because they apply to all of them and both are better than anything on this page: your professor's office hours, which are almost always empty, and your campus tutoring centre, which you have already paid for in fees. Students consistently underuse both and then pay for tutoring that duplicates them.

Get the number before you pick a plan

Study effort should be allocated against the actual gap, and most students never calculate it. If you need a 72% on the final to hold a B, that is a different fortnight from needing a 96% for an A — and in some cases the honest answer is that the grade is already decided and your hours belong in another course. Run the numbers in the final grade calculator first; the triage guide explains how to rank several courses against each other once you have them.