See this post for my general suggestions/thoughts on this subject: should-i-retake-gmat-thread-retaking-gmat-strategies-83339.html
I think it will be tough for you to get 220 points in 2 months and probably impossible taking into consideration that you have already done some prep and exhausted a number of resources.
You need a complete overhaul and start with books such as MGMAT Math Foundations
and Kaplan Verbal Foundations
and only after that move on to actual GMAT prep. Don't take tests for a while but instead focus on basics...
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