There are 2 types of BCG and Bain tests:
1. GMAT-like test with questions similar to GMAT
2. Online Test that is based on a case and has the questions closer to PST
So, I would recommend you to:
• Practice GMAT for BCG and Bain
1) Keeping your math trained with GMAT exercises is always a good idea. Free resourced can be found online, for example:
2) Also, tests that usually are for investment banks (with graphs analysis) are a useful. Free resourced can be found online, for example:
https://www.tptests.com/Candidate/practice/Instructions 3) Official BGC Potential test examples: https://www.bcg.com/careers/path/consulting/practice-interview-cases.aspx
Practice PST. You can find some guidance on PrepLounge https://www.preplounge.com/en/bootcamp.php/interview-first-aid/master-the-problem-solving-test/guide-to-improving-speed-in-written-tests-such-as-the-pst
McKinsey PST is the hardest one, so I recommend starting and tracking your prep using PST materials. If you have good results with PST, other tests are not a problem. For this you can:
• Buy Viktor Cheng test prep program - the best materials I've seen so far.
• Practice your math.
Do the 2nd test and check the score
Also, you can find a good number of PST tests online