Then how can we be "free beings"? Can you do anything *other* than what God has forever foreseen you doing?
If God has forever known that tomorrow at noon you'll do X, then when the time comes, you can *only* do X. You can't not do it, and you can't do Y instead. You can only do what God has foreseen.
If you make what you feel is a free choice, and God has always known what you'd choose, then the "freedom" is just an illusion, as you made the only decision you could have made. If you could make another choice instead, then the god isn't omniscient.
What would be the point (for anyone) of your running a test when you already *know* (absolutely and unchangingly) what the results will be?