Hey there :)
Bain’s online assessment is usually the SOVA test (logic, numerical, verbal, situational judgment) or the Pymetrics-style games depending on the region. The content is not case-based like BCG’s chatbot, but more about problem-solving speed and consistency. The best prep is: practice GMAT-style quantitative and logical reasoning questions (platforms like GMAT Club or SHL practice tests), refresh quick mental math, and look at some free situational judgment test samples to get a feel. For the games, you don’t really “prepare” but make sure you’re consistent and focused.
Overall, no hidden case library is needed here ...practicing under time pressure with numerical/logical test platforms is the most effective.
best, Alessa :)