I have given GMAT today. Scored 720 (Q51, V36).
Here is my story.
Started Preparation in October, 09.
Referred following materials
1) OG
2) Manhattan SC Book (Must Read)
3) 800 Score Material for AWA
4) Just browsed Manhattan Quant, RC and CR books (not much useful)
5) Also browsed 800 Score material for Quant (especially Probability, P & C)
Test Scores in chronological order
1) GMAT Prep 1 (Before Starting Prep) - 620 (Q48, V27)
2) GMAT Prep 2 (After prep) - 730 (Not attempted AWA here) (Q50, V39)
3) 800 Score Practice Test 1 - 660 (Q44, V35)
4) MGMAT Test 1 - 650 (Q43, V36)
5) MGMAT Test 2 - 720 (Q50, V38)
6) MGMAT Test 3 - 710 (Q47, V40)
7) MGMAT Test 4 - 730 (Q49, V41)
8) Kaplan Test 1 - 600 (Q50, V29)
9) 800 Score Practice Test 2 - 600 (Q41, V31)
9) Kaplan Test 2 - 600 (Q42, V31)
10) Kaplan Test 3 - 620 (Q50, V31)
11) MGMAT Test 5 - 710 (Q50, V36)
12) MGMAT Test 6 - 730 (Q51, V38)
13) GMAT Prep 2 Repeat - 740 (Q51, V38)
I really want to thanks Manhattan Group. The Manhattan SC was simply superb. And Manhattan Tests were very close to real GMAT. After doing Quant Questions on Manhattan Tests, GMAT Test Quant was quite a cake walk.
Also Kaplan Tests were quite far from actual GMAT. Good to give them for experience however their scores are really screwed.
Let me know if anyone need any further insights from my experience