Welcome to GMATclub, I think there are a multitude of very useful posts on this forum which articulate your exact goals of getting a good score in <2 months and it is certainly do-able.
I did 2-3 weeks of solid work, but I am sure a bit more would've helped.
1. take a read of any of the gmat books out there to see the structure/types of questions (SC = sentence correction, etc) ;
2. Take a practice free gmat test from any of the online providers and see what the areas you need to work on are.
3. Identify them and go to the basics, (you have 2 months) and tackle them using resources on gmat club - if you search for it and cannot find it, reply back n i'll link to it
4. start doing practice tests wherever you can and check on performance against original
The key success factor, I think, is NOT about quantity of problems you do, but seeing patterns and over-arching trends to help you identify problem types and solutions.
Good luck and browse around n you are bound to find a ton of resources.
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