Damn .. this is a day that I'm actually, gulp, working. Okay, how about Doron Lamb shot 38% in high school (from 3) and then, with a better supporting cast spreading the defense, shot 48% from 3 in his first year of college. Dwayne Wade carried a RSCI rank of #51 (I believe) in his HIGH SCHOOL class before becoming the 5th overall pick in the draft.
Marshon Brooks fits this category in my opinion (it's all about subjective).
Jimmer Fredette (yep)
Westbrook
Curry
Granger
Millsap
Hayward
McGee
Jason Thompson
Maynor
Okafor
Wesley Johnson
All of these guys did much better than expected when moving from high school to college. I'm not sure I'm understanding your question, though .. so let me know.