Copyright 2012 Andrew Dobson
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Yeah, this is why Tenko looks too young to go to college. It's because he is.
EDIT: Here in the states we like to reuse terms. In High School (9th-12th grades) you start as a Freshman, then go to Sophomore, Junior, Senior. When you graduate from High School and go to College, you start back again as being a Freshman and work your way back up to being a Senior before graduating for the second time. It's pretty stupid, if you think about it, but that's the way it is here.
So when Tenko here says he's a Freshman, he means he's just starting High School. That means he has 4 years left before he goes to college, hence why Carl is rather perturbed.