Regular practice will make you more fluent and confident. Last minute cramming is difficult!
Little and often produces good results. Intensive, focused revision will help you to absorb new language structures.
Arrange vocabulary alphabetically, under topics or according to word families.
Learn the appropriate article at the same time as the new word (e.g., le/la/les, der/die/das).
Write notes and language structures without looking at your module material. You'll be pleasantly surprised by what you can remember. Then work on the things you didn't get right.
Do any exercises you haven't done before.
Find someone to talk to in the language.
Use the language to summarise a unit, saying what you have learnt about the theme.