One of my most recent study tips that has been huge is drawing pictures. For some of your major, this may not apply to you, but if you are in medical/science/some literature/etc. classes this may help!
Even mapping out systems helps you memorize the overall and then you can fill in the detail by memorizing flash cards or something!
I hope this helps!
Oh and going back to a previous one, use color in these!
31 days down, 334 to go!