Have you heard of the cellulose-graphite method?
That is paper and pencil! I am very serious about that!
Let’s say that your test is on chapter one of the textbook. The using a pencil and a pad of paper go to the textbook. Now begin with the first worked out example in the chapter. Copy it exactly as it appears in the text. Do that for every example worked out in the text. When you have finished with the material, start over. Only this time use a blank page to cover up the solution. Try to guess what will come next. Then move the covering paper down one line at a time, each time try to guess or remember what comes next.
This is actually a proven method. It works