Managerial Accounting - where?

[Jennbean1]

Hi all. I have completed Principles of Finance, Financial Accounting, and College Algebra with no real issues.  I however for some reason am struggling with Managerial Accounting. I started at Straighter Line and a dropped it because the course material was laid out in a way that made no sense to me and I was watching Tony Bell on YT to learn. I didn’t think I could pass a proctored final at SL with no notes. 
I have to take it. But and trying to decide if Study.com or waiting to take it at UMPI is a better choice for someone who just doesn’t seem to remember all the formulas. Anyone taken at either place and can recommend the path of least resistance? Thanks all!