The people interviewing you are trying to assess the likelihood of your getting through the course successfuly, so it would be inappropriate for us to help you. Do not worry too much about making some slips - if you knew everything, you probably wouldn't need to take the course.
The instructions for such tests normally say that you may refer to reference books if you wish. I would suggest that you check the names we give to the various tense forms of the verb. You'll find some initial help here: English Glossary of Grammar Terms - UsingEnglish.com
Good luck with the course if you are accepted and decide to take it.