what is the best technique to retain memory?

Question

when it comes to school i do well mostly because i can do well on the test. the thing is, i study hard for the tests but after its over i seem to easily forget everything i absorbed. i find myself going over old notes from a year ago to keep it fresh in my head.
is the only way to just keep reading the stuff everyday?
i know mnemonics works for words but not for science.
ive seen a stat sheet of the avg person retaining memory and it declines every hour that goes by if you dont revise it that same day and even worst if you dont revise it at all. are there more ideas you have for me instead of just rereading it and revising it? what works for you people because when i go to grad school im going to need to remember things i learned 4/5 years ago and keep it fresh and ready to use at any time.

please, real answers folks. if youre going to be a smart *** and give me little 8 yr old comments then please dont waste your time or mine.

Answer 1

That's one of the biggest issue many people had, it would be the most easy and reliable to read it once in two days, or maybe even better, use it everyday, if possible.

I used to find myself recalling something I've learnt before everyday.

But if you want to learn some of the techniques,
www.memoryedge.com/

Answer 2

Icant remember....
I forgot it.....