Another very good tip:
Get yourself eight small cards for each tense that you want to learn. On the front of each card, write the tense at the top of the card and then write a question from the book, for that tense, underneath it. On the back of the card, write the tense at the top of the card, and then write the answer to that question underneath it. This way you will learn to write and speak sentences using the correct grammar. These cards can be used to practise your English wherever you are.