not a fan of the TIA support but the videos and resources are helpful with the app they have.
In terms of CBT support is is nonexistent compared to others like Exam 5 & 8, basically you got a few excel exams and you are on your own otherwise.
I really like the Rising Fellow cookbook for the upper level exams for the “problem” portion of the exams, it does an excellent job of walking you through how to solve them and why, not just a regurgitation of the source material like some sections in TIA are done.
TIA + Cookbook for me. Source + Cookbook is probably fine but a lot of it is awful to read and I’d rather listen to it on video/audio.