I am bad at guessing but yes I think that last minute decision of buying Manhattan's SC bible helped a lot.
I got this book 2 weeks before the exam and went through it second time just a day before the exam. I got a question on Colon ':' , Semicolon ';' and being non native, I would have got these wrong without
MGMAT SC guide.
So this book should be must for all.
RC, I usually get inference questions wrong because I always use memory to answer RC questions. Lately I tried to revisit the passage but it was too late.
CR: Find Conclusion, Assumption and that is it, accuracy increases as one concentrates, visualizes and draws diagrams, if required.
2 weeks before the exam, my confidence level grew in Verbal as I was consistently scoring in 33-38 range. (previous range was 25-32)
Still, I believe that maintaining your calm will go long way.
My Test Scores (far from good):
------------------
Kaplan Paper test (got it from a kaplan student) - 670
GMAT Prep1 - 650
kaplan CD Test1 - 580 (I was devastated)
kaplan CD Test2 - 620 (confidence shattered)
kaplan CD Test3 - 640 (no improvement)
800V4 - 710 (these are easy, so don't count)
800V2 - 730
kaplan CD Test4 - 670 (still bad)
Gmat Prep1 (Retake after 2.5 months) - 710 (i wanted 750 as it was repeat)
Manhattan 1 (got this with SC book) - 640 (man, confidence lost even in Quant)
Manhattan 2 - 670 (9 wrong in quant, should I postpone the exam and revisit basics?)
---2 weeks before Final
Kaplan Course Test 2 - 780 (One of my friend, who is kaplan student, sacrificed his test for me)..I am on high
Manhattan 3 - 730 (Wow..I am doing good)
GMAT Prep2 - 720 ( 5 days before actual GMAT)
Manhattan 4 - 760 (2 days before final)
Final - 760
I took 3 exams including final within 5 days, it is risky but I was enjoying the high scores.
I noticed that earlier I was not concentrating on 1-10 questions, last 2 weeks I worked on this and improvement was visible.
My take on different Mock CATs:
1. Kaplan - Easy quant, Good Verbal.
2. Manhattan Online - Good Quant section(don't loose moral), easier Verbal
3. GMAT Prep : Very similar to Final CAT. Quant as well as verbal falls in between kaplan and Manhattan.
4. 800: easy questions, not truly representative of actual GMAT
Manhattan has tougher questions in first 2 exams, so don't loose confidence.