God "foreknows" them that are his (he chose them, remember?), but their future is not predetermined.  He doesn't know what they're going to do any more than you know if your son is going to drive drunk or your daughter is going to overdose on drugs.  You can establish "rules," but that doesn't mean they will abide by them.  If life was "predetermined" we wouldn't have a choice.  That's the debate...do we or don't we?

From birth, you are "predestined" to be a child of God, or you're not.  You didn't choose your earthly father, neither do you chose your heavenly Father.  If you're a child of God, your choice, you only choice, is to obey or disobey God...that's freewill.

Predestinate (proorizo) means you were "ordained" a priest from the womb; but when he calls, you have the "freewill" to accept or reject the "ordination."  If you accept, become born again, and turn your will over to God; the Holy Spirit will guide you on the path God has chosen for you.  If you reject it, you are left to your own devices...that doesn't mean you can't return to God; only that your life will be miserable until you do. 

Do not be deceived: God has set before you life and death, blessing and cursing.  He hopes you choose life, but it's your choice.

Until you're reborn Spiritually...nothing else matters.