Act test

Hello, Mr Brown
The Act test is hard for me becasue i'm an ESl student and i have to take it this year. Could you give me some advice how to be successful on the writing test and English section in Act test? On the English section, the grammar is mixed together and i don't know which ones is right or wrong. The vocabulary is hard also. How can i improve my vocabulary? It's hard for me to remember the vocabulary for long time and i forget what i've already learned.Do you have any suggestion about that point?
Thank you:)