Dear XX:
l am glad to help you,As for how to study English.Here is my way.
You said that you can't remember words ,I think you can make word cards to renmember them.It's easy to syudy grammer too,You can take notes and ask teacher for help .It's very important to handn up in class . It can help you not very shy to have a conversation with others.Just make sure to try your best ,you can do every thing you want.People says:"the habit is the best teacher "so,you must let English to become your habit and must work hard.
I hope my advice will be of some help.
Yours
XX