GMAT Strategy

These were my scores in exam today Verbal 21 Quant-42 Total 530 as opposed to 28 August Verbal 27 Quant 37 Total 540 , My highest level has been 31 in verbal and 42 in quant In today's exam verbal was difficult so I thought I might score good with 1 long passage and total of 4 passages , I finished with 25 minutes remaining in verbal but in Quant my timer went off with 3-4 questions remaining , I have my GMAT exam within week time and I thought I could score atleast 600 ,I have worked hard for Quant and was thinking of doing quant again for 3-4 days with my Vebal covered, , I used Powerscore Sentence Correction , MGMAT SC , Powerscore CR , MGMAT CR(new one to supplement Powerscore since it contains some high End Question Types not there in 2012 Edition of Powerscore , they have even put newer examples but lesser in Number than 2006 Edition. How do I increase my score. I reviewed my last score in GMAT prep and seem to have same no of Incorrect questions , also questions today were more of business and science topics in CR and RC though SC seemed easy.
I dont know what to do should I practice LSAT difficult questions.