ive been an EA for 4 years now, this might not be the response that youre looking for ... but in reality ... this is EXACTLY what you have been looking for:

i got Gleim. it basically gave you an overview of the subjects an EA needs to cover, and their material helps you pass the exams. once you acquire the official EA designation, you soon learn that you only know about 15% of what you need to actually know in order to prepare accurate returns.

You want to learn how to prepare corporate returns? well, first, take an accounting class so that you understand how to make a balance sheet balance. Want to understand C-Corps? Take some self-study webinars and buy a few books. After a few months, you will probably get a better "idea" of how these returns work. Its like this with literally every facet of Tax. You arent going to learn how to prepare Estate and Trust returns in the 8 page chapter Gleim layed out for you. Gleim is kind of like a guitar instructor showing a student how to play an A chord, but not telling the student that the A chord contains the notes A, C#, and E.

The other problem with tax is that there is no "Golden Book" that shows you everything you need to know ... you just constantly dig and dig and dig for more resources so that you slowly grasp new concepts and absorb more information. and believe me ... theres a LOT of crap to learn. You could literally learn new concepts everyday throughout your entire career in tax and still never really get caught up with all of the rules and regulations. Its kind of unfair, but thats the reality. Its a constant struggle.

Dont hate Gleim for not teaching you everything you need to know ... be appreciative that they opened your mind to the realization that you still have a lot of hurdles to jump over.

FWIW - i dont hate Gleim ... i hate myself for getting into this stupid career. hahaha.

Wish you the best of luck