Some pointers :
1)Quant - you don't need to do the MGMAT advanced quant
book . It's not necessary to do that book to score a Q 50 . Incidentally , I scored a 50 in quant without doing that book . The difference between a Q 47 and a Q 50 could be time management . Did you have to randomly guess some questions at the end because you ran out of time ?
If you want to reach the higher levels In quant you do need to know when to give up on a question . Beyond the 3 min mark just GUESS and move on ! Don't go with the mentlaity that you absolutely have to get every question right .
In terms of material I would say do the questions in the GMAT prep question pack and also do the GMATCLUB tests
. I think the MGMAT advanced quaint guide will take too long to do ( and I don't think you have sufficient time )
2.Verbal - For SC the most important thing is to review ALL OG questions , irrespective of whether you got the question right or wrong .If you want to do a course do the GMAT SC course , it's pretty good.
But I feel first you need to figure out what your specific weaknesses are , in SC and do some targeted practice ( as I mentioned earlier )
Hope this helps ! Posted from GMAT ToolKit