Everything Mega Lecture teachers have written for O Level and IGCSE Physics, in one download instead of 192 separate files:

Topic notes for every chapter of 5054 and 0625
Topical worksheets with marking schemes
Formula sheets, definitions and revision summaries

Delivered as seven zip files (by section, each under 80 MB so it downloads on a phone) with a README index. Written by Mega Lecture teachers; for personal study. The same notes stay free to read online, one at a time, on the O Level Physics notes page.