^^ Negative... like HD said, you have to be a contract Pfc. (E-2) and be an honor grad in boot camp to get E-3. something like. 15 semester units gets you a win for E-2. I can't really speak for the Navy, because my recruiting experience is limited to Marines, but I'm still pretty sure you can't attain higher than contract SA (E-2)
You definitely can contract for E-3 in the Navy. I know that the college credit cutoff was 48 credits for a contract as an E-3 and 24 credits for E-2 (circa 1993). From what I've seen, those numbers have not changed.