FlashcardExchange -is a tool to create flashcards saving you a lot of time
Time edition – helps you track how much time you spend learning
PocketMod – can help compress your study material into small blocks – for example, you can store all your math formula details of together in one page.Whip it out when you want to learn them by heart
Web Seavus Dropmind and MindMeister are two online packages that can help you create Mindmaps.
Some best content resources for subjects especially Math and Science online are Khan Academy, Brilliant, Virtual Nerd, STEM, Desmos, GeoGebra, CanFigureIt Geometry, PhET Interactive Simulations, and CueThink.