If you feel insecure about any of the above, it is a good idea to start preparing for your test ON TIME.
You can do this by:
Studying the unit 3vocabulary
Doing the exercises about grammar again in the online book
Doing the Test Jezelf and Versterk Jezelf online
Asking classmates or your teacher for help or extra explanation
Practise online on www.englisch-hilfen.de or www.perfect-english-grammar.com or somewhere similar