Hey , just go through the the below article , it migh thelp in how to keep the log :-

https://www.beatthegmat.com/mba/2010/11/ ... -error-log

You can go for as many full length test , provided you are not just giving tests , evaluate your mistakes , timings and accuracy . Identify the weak areas and work on them while keeping the strength polished . To start with brush up all the concepts and then start solving questions , if you are good with accuracy make the effort timed one . Slowly and gradually increase the difficulty level of your practice . If u ever feel bored or tired [you are bound to feel so at a point of time] , then take GMAT as a game .

Hope that helps .

The article link you provided really helps!

I purchased the Quantitative package from MGMAT because I'm weaker in Math than I am in Verbal. I haven't received the books yet, but I plan to use them to learn good strategy skills and apply those skills to the practice questions in the book combined with the practice questions from the Official Guide (12th ed) to nail down the concepts. I plan to apply the same technique when studying for the verbal section.

Is that what you mean when you say brush up on all concepts and then start solving questions?

Thanks for you advice =)

Yeah you seem to have a good plan , go through OG's and the materials you are buying i.e. MGMAT . Work on your weakness but do not neglect your strength. Good luck with your preparation.