The grade will not count for your UC GPA, but it would count for grad school. You could take it CR/NC I guess, but honestly, if you have any hope of doing well in Chem 4A at Berkeley, you should be able to get an A at community college summer school....
You should take the "real" chemistry, whatever they are calling it, the one that is for biology majors, not the one they offer for nurses and such. You could also get the Chem 4A textbook and read it along with whatever textbook they are using at community college, for deeper studying and preparation.
People show up at Berkeley, take a course like Chem 4A, and are COMPLETELY blindsided. They've never had a course they really need to STUDY for, study hard for, and they're not ready. So you want to prepare yourself as best you can so you can hit the ground running. If you spend the summer getting prepared, you will thank yourself 10x over in the Fall.
Also you can go to webcast.berkeley.edu and you can watch the Chem 1A videos which are really cool and you can check this out
Welcome to Chem 4A