What Fillsfan said is ditto for Pop Up, as most of you know already. I tried to impress in son that good grades gives one options, without them you have very little to work with. According to son, after some initial learning the hard way, he is one of JC coach's top players, and is doing well in school. Other than pot smoking roommates, he is having a good time. JC is a bit easier on these kids, because they take fewer number of classes, may go to class one day at 10, may have off days too. It allows them more time to study, and the mandatory study hall helps.
I know of one local NW player who did not have good grades, but he was already on MLB watch list and went third round. A large NW college had him signed, but it was for show only, they knew he would never attend their school. If the MLB people like you enough the D1s will recruit you too. Trust me, if you are high on their list, you would know it by now.