GMAT Practice Test Number 2

I bought the Manhattan GMAT 7 book series, to use as a reference and still continue to look at other sources and for certainly to the official review questions simultaneously. After completing first two books:

Number Properties and Fractions, Decimals, & Percents I attempted my second Manhattan GMAT test on June 29. According to some source these test estimate your score within 50 points, so I was happy to see a 20 point jump in my score:

TYPE	SCORE	ESTIMATED PERCENTILE
Quantitative	46	79 %
Verbal	34	72 %
Total	660	86 %

Well this was 3 weeks ago. That seemed really great at that time.