The best way to remember everything is with flash cards or notes.
Just read the word and the definition, and then forget about it. After some time has passed, read the word and definition again, and then forget again.
Forgetting is very important for learning. You learn, forget, learn, and forget until your brain gets tired of relearning the word. Your brain then decides to just remember it!
You can even read many words and definitions at once, like a page of notes, and then do something else while you relax and forget. Then read the notes again and repeat. It is the easiest way to learn.
Also, get a good amount of sleep every night. Sleep will help with learning and memory.