It is effective to take notes as a memory aid.

choices are

(t)rue or (f)alse

The answer is true because you can remember the answer, or how to solve the equation easier. 

Take social studies for example. You might need to remember how long the Korean war started, or when the cold war ended. If you look it up, and study more and more, then that is flexing your brain muscles and that is what wakes up the long term memory banks. After a while, you will know it like the back of your hand. 

Hope I helped! 

Ancestor of grendol was beowulf