Boycott the Healer
When you first discover the Danger room sequences that call for you to "Call for Help" simply do not complete the objectives, in these rounds. This will help you by constantly providing you with enough health packs, and energy packs you need throughout the game. So, when you run out of health; simply go to the save point, enter the danger room, and enter the freshman teamwork scenarios. Remember, do not beat the scenarios, to continue an unlimited supply of health Packs.
Back to Cheats
The best way to get a extra utens is to fail the Danger Room courses. If you complete a course, the next time you send in your team they will not receive anything for their trouble. However, the first "final exam" as a freshman is a very easy one. Just do not destroy the generators. By doing this, your team can run around kicking butt for quite awhile and collect a lot of times. Note: Make sure all your teammates are set to auto-refill their health at 80% (this can be changed in the first field of the detail view for your characters). Also, watch for the inevitable cut off time (about a half hour in). At this point, the villains will no longer give anything up. Then, destroy the reactors and leave. Make sure to sell Forge anything you absolutely do not need; otherwise about halfway through your available time your inventory will be full and you can miss out on some good items.