Replying to your PM.
Dude your quant is awesome, work on verbal. I have no idea about your target gmat score, but I guess aiming 650+ would be realistic one.
To achieve 650 you got to get either of the following scores:
Q42 V37
Q46 V34
Q47 V32
Q48 V31
Q49 V30
Q50 V29
Considering your present quant score, I guess you'll need 37 in verbal to achieve 650 GMAT score.
Your current GMAT verbal score is 9, that means 28 points jump is needed.
Few points I would like to suggest:
1.As you are scoring in 590 range (don't have splits), for verbal you must not have faced questions of difficulty level 650+ to 700+. The questions you have faced till now are of difficulty level 500-600. So even if you analyze your tests, you won't be able to decipher what you are going to face in 650-700+ questions.
2.You are exhausting your tests, that's bad idea. One test can show your progress. 1st diagnostic test gave you 590, you should have analysed the questions and then made concepts clear before facing next test. This way the next test you could have faced with 600+to 650+ questions. and so on, till you face 650+ to 700+ questions.
3.Retest is best idea, let me tell you why. If you retest 590 test, you know the answers of the questions you have faced already so automatically you start performing good and test starts throwing you with high difficulty level question, which you have not encountered in earlier effort. This way you get access to 650-700-750+ questions.
4. You are good at quant, you know what it takes to be at Q42. Have you ever faced any quant question, where only one concept is tested at a time. Such as,
A circle has radius of 5, what is its Area? . Anyone who knows the formula can solve this problem.
but if same question is presented like this,
Rectangle ABCD is inscribed in circle and has sides as 3 and 5, what is the area of circle? can you tell me now, by knowing just formula will you ever be able to solve this problem? The answer is straight no, cause more than one concepts are tested in one problem.
As difficulty level increases, number of concepts tested per problem increases. Same is with verbal, more that one grammar rules are tested at once, so just by knowing rule you will not be able to arrive at the answer. In real GMAT SC, I bet you if you find any question which tests only one concept. Most of the time you find one issue such as in 'Not only..but also', you find that 'not only' is given but 'but also' is missing, so you try to find the answer which has both phrases and mark the answer, and you get it right too. but you miss which other concept other that 'not only...but also' is tested. So while analyzing any question analyze the ones which are right as well.
5. Don't go for much material, use legitimate sources. The ones you r using right now stick to them.
6. I used to solve only 10 SC question a day, analyzing each over n out. even if you do this for 30 days, you would've solved 300 questions by then. makes sense, doesn't it? OE overlooked is concept missed. No point in solving 50 SC questions in one day, its equivalent to doing nothing.
7. Don't stress too much, read interesting material from published magazines, from hollywood gossips to sports to politics. Reading helps a lot in improving verbal, I have experienced it. Keep in mind, Smart practice makes perfect.
Will be happy to help always.
I am not here for kudo, but to help.