I have a Game 10 tournement coming up and Im not sure how to prepare for it. Should i study tactics,openings, endgames, etc? Im used to G60 or G120 so this catches me off guard. Thanks for the help~!

G/10 is just a bit slower than blitz, so tactics will probably rule, but the best preparation will be to play as many G/10 games as you can, just to get used to the time limit.  Every time limit is different, and you should practice an unfamiliar limit before trying it in competition.