from 610 to 570....flood to tsunami

hi, I took the GMAT exam a few months back..honestly speaking i had studied for 3 weeks only!!! i scored a 610. (Quant/Verbal:45/28) This time...i studied coverng most books, practicing verbal very well..practiced from Princeton,Manhattan SC, 1000SC, Arco..etc..and I still CANNOT believe it...my sco...