The level you'll get with your "Basic Certificate" is the Level A2+ in the Common European Framework. I would compare this level to the PET Cambridge Exam (Preliminary English Test), but this is the B1 in the Common European Framework ( so the level is higher).
This means that the activities you'll find in this website are a bit, but not a lot, more difficult that what you can expect in your June exam.
Practise these activities: Reading, listening, writing and speaking. Remember that they are not easy but if you are able to do them, it will be easy for you to pass your exam in June.