Math - Need workbook for rearrenging formulas. Please help!

I'm a young adult that wishes to master rearranging formulas within 3months I don't have the time to work through all the Khan Academy topics (work 10h a day) and believe that I would be better of with a workbook that focuses heavily on rearranging formulas from the simplest to hardest works. I plan to spend 2hours on the book every day until things start to stick.

Bio: Was a top math student but moved countries in my teens and spent two years learning English at an English-only school my math was totally neglected and I never learned how to rearrange formulas. Therefore, most end-of-school math was a pain for me but I wish to change that and work on what originally was my strength.

Any advise is welcome. Thank you!