Hello and thanks for your question!
As I needed to run through the test ~1,5 years ago Roland Berger sent me a practice link to prepare for the test. I practiced with this test a few times and did nothing else apart from this. To be fair the test is not that easy BUT my personal performance in the test was for sure not the best and still I passed and was invited to the interviews. So don't worry too much and prepare yourself with the help of the practice test. Good luck!