First attempt at GMAT 610.Suggestions needed.

I recently gave my first shot at GMAT.I ended up getting 610(Q-50,V23 ).I referred to the following books for prep:

OG guide 12th edition
OG verbal and MAth
Nova math bible

When i was studying or practicing i used to get most of the questions correct in the verbal sections but during practice tests i ended up making many mistakes.I started doing the practice sections very fast and in the process i ended up making many mistakes during the practice tests.And if i was slowing down spending extra time than what i normally do i ended up over analyzing the answer choices and goin even more wrong.
I started my prep in Aug and i dint go for any classes.
In the main GMAT exam I went in little worried about my AWA.Luckily i had an idea about the topics i faced so felt confident about my AWA which helped me through my Quant. Maths being one of my strengths i went about my Quant with out any problems .Then the nightmare had begun.I felt confident about my RC AND CR and i knew i was going to screw up my SC .SO i just went ahead with it and finished in 40 min odd.I was expecting probably a 650+ and was disappointed with my score.I have not yet booked my date for GMAT but i want to start preparing and once i feel good and start getting better scores i want to book my date.
I recently got hold of the Manhattan 8 book series.As i have already finished with OG guides where can I find books for practice.
Previously i finished the GMAT prep tests.Can somebody suggest some tests which can be purchased which would be the best for practice.