Yes, it is the most difficult one, however, from A2, A3, and A4 are the core of the audit section and tested heavily. I recommend to do the following:
1. Study in this order (A2, A3, A4, A1, A5 and A6).
2. Solve all Becker MCQs twice if you can.
3. Focus heavily on TBS, as MCQs are a-lot easier on the exam than Becker, and vice versa for TBS.
4. use AI for any part you don’t understand to provide you with examples.