Mathsaurus
Free maths videos and past papers for GCSE, A-level and Add Maths as well as university entrance papers (STEP and MAT), all created by an experienced teacher and mathematician. Also have a look at the Mathsaurus YouTube channel!
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The creator of the Mathsaurus is an an Oxford (and Birkbeck) Mathematics graduate and experienced teacher and tutor, having taught for seven years at leading London independent schools, and is now based at the University of Bath.