Hi Blimp66,
I am a neophyte appraiser, only recently licensed. I empathize with your statements on income property math. Since I've had lots of calculus and such (yech!) due to a previous life, understanding math really wasn't a problem. Some of the allocation methods and various income approaches did confuse me at first.
My best thought is to work through a LOT of problems where you can refer to the answers when your puzzled. I bought a text "Q & A" something or other. I think it is by Tosh & Rayburn. It is currently on loan to another individual studying for the exam. Each problem is solved step by step in the back.
The good news is the first exam has minimal income approach problems of any serious complexity. If you would care to post a specific challenge your having, there are many well qualified folks to explain the concept on this forum. I can help with math issues if you need that.
My experience with the test: basic concepts dominate. GRM, GIM, IRV, NOI, etc. However, if you will take the time to work through the backbreakers, it will reinforce the basic concepts so well, you will breeze through the exam.
Good luck,
Bryan