One of the things you will necessarily have to learn by heart are idioms and phrasal verbs. To make this task easier for you, you can complete the following online multiple choice exercises:
Phrasal verbs on crime
Phrasal verbs on emotions
Phrasal verbs on food and drink
Phrasal verbs on Travelling
Phrasal verbs on Illness
Assorted phrasal verbs
I think that is enough for now.
Have fun!
