What do you usually do the day before an exam?
I prefer to do a summary - It fits here better than "like + doing". You should also say a word about what you're summarizing: a summary of all the courseEverybody memorises something. (Everyboby does - like he she or it)The teacher has to help students to revise the course at the last lesson. - A class is usually a group of students or a room, or a lot of lessons (to go for a walk after classes),the word "lesson" is usually used when we speak about the topic of the lesson, the process of studying. When you say a teacher has to revise it means that teacher himself should revise everything, if it is really what you were talking about then everything is fine.
Well done! Keep up!