You can try to answer one full test to for diagnostic. However, you will need someone to evaluate your writing and speaking. You will need an all 7.0. For many people, that's hard, but if your English...
Hi there! I think different centers cater to different needs. I enrolled in two review centers. The first one did not really help as they told me my Writing and Speaking are already a 7.0. I got 6.0...