All of these tests are very similar
Format? Somewhat. Content and what's required from you ability-wise? Not at all.
The best way is to really find online tests / questions and practice. Regardless as to whether is a new or old test, the principles are mostly the same:
- Time management (need to think quick)
- Business knowledge/context (incl key formulas)
- Critical thinking (answers that are very similar to each other...clues "hidden" in the text)
- Ability to interpret data/charts
Think of it as a merge of a case and the GMAT/GRE.
You need to be clear on some key case-related and account formulas (margin, growth, breakeven, etc) as well as be good at critically understanding the question (including nuance to questions) and parsing through complicated text with a fair amount of distraction.
You'll also need to be good at chart/graph reading.
The (old) McKinsey PST, BCG Online Test, Bain SOVA test, etc. are all quite similar so leverage resources across all of them.
Helpful Prior Q&As: https://www.preplounge.com/en/consulting-forum/has-anyone-taken-the-bcg-2021-potential-test-if-so-could-you-share-your-experience-which-industry-is-covered-9154