Well,
I think a long preparation and making sure you understand all concepts and every one of them.
It seems that on both Q and V you need to work a lot.
So reading the concept and doing a lot of practice will bring everything to life for you.
As you perfect your understanding, you will realize your strength and weak areas letting you to work on perfecting your strength first and improving your weakness.
For the verbal, i have one suggestion and that is only and only work off of official materials and respectable sources such as LSAT for RC and CR.
Your choice of Preparatory courses is up to you. Do your search and go for one and stick to you. Do not try to jump off many courses. At the end of the day, all teach one thing: GMAT.