This is first and I passed. I tried the GOAL, Mahler’s study aids and Mahler’s practice exams. It should be cognized Mahler’s aid was hard to the most of candidates. It has 5000+ pages. Indeed, I had read it but I don’t think it’s necessary.
I think you should focus on the question of aids. It includes some fixed type of questions. The part of stochastic model was relatively certain question type. I suggest the GOAL. It can help you establish a conditional reaction. When you see some keywords and you will react how to calculate.