Help, i need to now how to memorize better?

Honestly, the best way to study is to study every day and not to wait until the night before the test(s.) Waiting until the last minute is a guaranteed recipe for failure. There's a reason why the kids who study hard and study frequently make the As and those who goof off make Ds and Fs (which they deserve.) Splashing water on your face won't make you smater, it'll just make you wet. Sit and read (and stay dry.) And next time, start your reading and studying as soon as you know when your test/quiz is announced.