Hand 1:
Since the raise is from the big stack and you our hero only has 650 chips and needs to double up, this is the hand to do it on. The big stack can have a bigger calling/raising range and a 3xbb raise isn't as indicitive of strength as a 3xbb raise would be from a middle stack.

Action: Push

Hand 2:
I'd rather not chance the last thousand of my stack on middle pair, had the aggressor been on the BB and checked I'd be more inclined to think that he has a worse hand than me, as it is if you fold here you still have enough chips for about one to two more rounds before you are forced to move all in, and during that time you can probably find a hand with better chances of winning.

Hand 3:
With so few chips and you moving through the blinds in the next two hands I'd push this. Normally I'd look for an ace with something over an 8 in my hand, but if your blind hands are unplayable than you will be left with only 460 chips, whereas if you go all in now and double up you'll be sitting well with over 1k chips and some more time. I'd push and pray.

Action: Push

...you skipped hand 4...

Hand 5:
Ideally here I'd like the blinds to fold, adding 150 to my stack here would be nice, against overcards I'm a favorite but I'd rather they just fold, against underpairs I'm a 4 to 1 favorite, the only worry for me here is overpairs, and with how quick these tournaments are you have to put that possibility out of your mind.

Action: Push, hope blinds fold.

Hand 6:
You're already in the BB so only 300 to call and both other players out of the hand I'd just call here and see a flop. You also act first so even if you don't hit anything you still have one more shot at the hand if the board seems right.

Action: Call