All the advice I've ever heard is – always make your own flashcards, on whatever subject.
Have a look at mlcards.xpertup.com
I have been looking to make CS learning easy and fun. With so much clutter around, flashcards based active recall techniques are best to memorise concepts. So I ended up creating this cool Machine Learning Flashcards for software engineers and CS university graduates.
Thanks!! It looks something promising.
Chris Albon has a great pack on his website chrisalbon.com