GMAT Math

Just a little background. I graduated with a degree in finance from a top university, haven't seen math in years, and have serious serious ADD(also issues with memory of steps). I am on a break before I start a new job and have taken the gmat on as a job for more than 2 months from the time I wake up till the time I go to sleep. Realistically I have put more than 200 hours in.

I took the MLIC course and it was a complete waste of my money. Probably the worst teacher I have ever been in contact with. To give an idea of where I started from.. I couldnt do long division when I started. I am at a loss.. With all this hard work.. I took a test for the first time with manhattan and got a 450.. I don't know what I need to do. I am at a loss with the math. When I do a problem.. If I dont do 6 or 7 of the same and see the problem reguarly.. It wont stay in my head... Any suggestions... How this is probably why I study so much and dont get as much done as the rest of you guys.

I am considering getting a new math book to get back to basics or maybe I should just work out of the OG since my test is in 3 weeks. I need suggestions of resources to be using... Gmat hacks or manhattan gmat for getting through all the math from scratch to 600-700 level questions in 3 weeks... Alot of easy explanations!!!!

I need help creating a plan to make this really happen and not just talk about it... I have done all I can alone till this point.. I need some coaching or advice from my online community....

Thank you in advance,

PS MY Goal as high as it is is a 650-700