If you're good in Quant (let say if you score 49 or higher in Quant, with no Verbal JJ or even with 10 days of JJ you should be able to score at least 550 assuming you don't screw up) remember take your score in Quant and multiply by 9 and Verbal is multiply by 7 (error is plus or minus 10 points.) if I'm not mistaken!!!!
ex. 51x9=459 (Q)
20x7=140 (V)
you score will be 600 or 610