A W or a B?

Hey so I’m currently at a community college and I have a 3.79 gpa. I’m a math major, female and I’m hoping to transfer to UCB or UCLA. I had 3 B my first semester but since then I’ve had straight As. One of the classes I got a B in was physics and I’m taking then next class in the series and I’m afraid I’ll get a B or worse. Should I accept a B or get a W. If i get a W I won’t be full time anymore. Also how are my chances looking?