For most of the tests I do, I run through all the IC cards once, and then head to the specific exam feedback which is very helpful and review every item mentioned there once. It's usually around 10 hours for me, but it varies for everyone of course.
I didn't find Principles of Management difficult, but I also went through ALS before a few years before taking it. Hopefully your business classes help you out.
If you need more management or electives, I would use the strategy of grouping similar tests. Principles of Supervision and Org Behavior have some overlap which help your score a bit.
The CDCs are not hard if you are prepared. You sound ready but I would just keep reviewing until you test. I used the Master your CDC program as well. I scored 90 on my first 2 tests, and 87 on the third. (I cross trained and I was a 7 level in my last job)
Good Luck !
Excelsior: Bachelor of Science Business
Associate Aviation Mx Tech CCAF
Associate Healthcare Management CCAF
CLEP: A&I Lit, Freshman College Comp, Info Sys and Comp Apps, Intro Sociology, Intro Psychology, Principles of Management, Principles of Marketing, Principles of Macroeconomics
DSST: Management Information Systems, Intro to Law Enforcement, Intro to Computing, Intro to Business, Principles of Supervision, Technical Writing, Environment and Humanity, Organizational Behavior
EC: Info Lit, Internet Programming, Bus Law, Bus Ethics, Bus Strategy, Principles of Finance, Intro to Entrepreneurship, Ops Mgmt
ALEKS: Beginning Algebra, Intermediate Algebra, College Algebra, Trigonometry, Intro to Statistics
Straighterline: A&P I, Accounting I, Accounting II, Bus Com, English Comp I, Microeconomics
SLU: Global Perspective, College Mathematics
BYU: Public Speaking
PF: Art App, Music App