One of the best ones is to use the word you want to learn. Read and write sentences using the word you want to learn. Learn more about it by looking in books or asking friends.
For example, chemistry. If you don't know what it is search on youtube for chemistry videos, find a chemistry book at school or in the library, try some basic chemistry experiments at school or home.
Rather then cheat find a memorization method that works best for you. Then when ever you need to remember something you know you can do it.
Try different ways of remembering, some people remember things better if they remember how it sounds or looks or feels.
Some people need to write it down lots of times or repeat it out loud.