[ Standards & Testing ] Open Question : SAT IIs For Ivy Leagues?

Unfortunately I didn't know about SAT IIs and their importance until not too long ago, and since it is now my senior year I have to get good scores (and I only have October and November, not December due to deadlines). My SAT critical reading score is only 660 (other scores are very high), and an admissions officer at a college said I'll need at least 700 CR to be competitive (I'm aiming for Ivy Leagues and other highly competitive schools). My question is, if I only take 2 SAT IIs (minimum required) so that I can retake the SAT, will that be very bad? Because I know many people take up to 5-6 SAT IIs.