How important are hooks for ivy league colleges?

3.5-3.6 GPA is too low for any realistic chance of admission to an Ivy League school.

And the divorced parents will both be required to fill in financial aid forms at Ivy League schools. If they do not cooperate, no financial aid for you. Even if they do, you may find that they have put their money into their lawyers’ kids’ college funds instead of your college fund (divorce tends to be a financial disaster for those divorcing).

http://talk.collegeconfidential.com/financial-aid-scholarships/2083835-faq-divorced-parents-financial-aid-and-net-price-calculators.html may help you with financial aid issues relating to divorced parents.