The OPAT (or Occupational Physical Assessment Test) was implemented only a few years ago. It is designed to make sure a recruit will be physically able to meet the demands of his future MOS. If you do not pass, your ship-out date might be delayed until you do. Or, worse, you might have to pick another MOS. Talk to your recruiter about your possible options.
I cannot comment on the life and job of the 25B (Information Technology Specialist). I was a medic. Moving forward, do your best every day. Stay out of trouble. Also, trust your buddies, your NCOs and COs. From there, no matter what happens, the Army will be awesome!