I tried the "initial drill" and part of the "finance and capital one" and the content is rubbish.
The content is simplistic and makes sweeping assertions, the correct answer to most questions is "insufficient data".
Its very easy to guess the answer they want (I got it every single time) but in many cases I do not agree it is necessarily the right answer.
A text book would be better, and this convinces me of the value of studying business the conventional way.
OP, get someone who has a clue to write the content and the tests and then you might have something worthwhile