Biology revision that starts with the mark scheme
Clock it with SCI began with a simple idea from a biology teacher: students don't lose marks because they didn't revise, they lose marks because they revised the wrong way. So everything here is built around what examiners actually reward.
Written by teachers
Every resource is written and checked by a qualified science teacher who has taught the course and marked the exams.
Matched to your exam board
We follow the specification for your qualification, so you revise exactly what can come up, in the words examiners expect.
Made for revision, not reading
Short notes, clear diagrams and real exam-style questions with full mark schemes, so you can check your own work.
Free to use
Read everything on the site or download the PDFs to print. Tutoring is there when you want more help.
Based in Dubai, teaching everywhere
We tutor students in person across Dubai and online anywhere in the world, for GCSE, IGCSE, IB and A-level Biology.