What are my chances of getting into the coast guard or air force?

Looks like you did pretty crappy on the ASVAB big guy. No Offense meant. Besides your GT score is the score that really matters. If it is 110 or higher you can pretty much have any job in the military as long as you meet the individual requirements for that position. Keep taking the practice test until you p it with flying colors and you will be confident in scoring very high on the real test. I wish you the best of luck.