Is this a good way to make notes?Watch
What you are effectively doing is writing notes like in a notebook, just on smaller sheets. If it works then do it
Refer to this google doc - Link
I based this on stuff from wikipedia. This is just a rough example of what I would do when writing notes. Because of my trash brain I rely on key words, letters, and numbers. It is hard for me to memorize a lot of information w/o resorting to this method.
See those letters and numbers at the side? I use those as helpers to jog my memory to make it easier for me to recall what I want to remember. Eventually I would just be relying on those so I wouldn't need to bring a bunch of notes and papers. So if I would be using flash cards then it would be filled with a bunch of letters and numbers that only I would understand.
For math though unless you're really good at it all you can do is practice solving problems.
Hope this helps.