Any more online material or books that have many difficult quant questions for getting 170 in quant ?
Like for example GMAT all the quant book from Manhattan or something ?
You can solve questions from greprepclub and gmat club for difficult questions
As Manali said : Just do some gmat questions ; you can also look at extreme questions of the day but I prefer the prior(gmat) more as you can find various solutions to those question on gmatclub