Playing super tight is right. The majority of players in the freerolls will be well below average skill wise. They will be chasing flushes with weak Qx and Kx and will think A6-A8 are strong enough to play. Remember if you are in doubt folding is the best option. It's better to wait for spots you are sure about. I'm not going to call off my stack with AJ or A10. I throw away a lot of low pairs if I'm not on a healthy stack. There are always going to be coolers 2p<sets and what not, but if you play tight ranges of hands based on position you will give yourself an edge. Don't
bluff off your stack. If people are calling they generally have something and weak players will call you down with weak hands. Wait until you have the nuts and they will call you down as well. Bet sizing is very important. Don't bet too big when you are weak and don't bet too small when you are strong. Just because you have a decent hand doesn't make it good to call a large bet. When people over bet I play a much tighter range. When people under bet and I have a decent stack I will take cheap cards for the draw. Don't afraid to check raise people when you think they are
bluffing, but don't raise an insane amount, and start off by only check raising when you have a strong hand and are in position. Try 2.5x if you can afford it. If you check raise the turn in position most people will check to you on the river and you can choose to check back and go to show down. Most important thing I can say is put thought into every play you make. Before you make any bet or call or raise, before you choose to enter the pot ask yourself, does this make sense. Is this profitable. If I make this play am is it increasing my chances of cashing this tournament.