Everyone has a way of studying, and, of course, some ways are more effective than others.. Skipping class, not doing your homework, not concentrating on your work are bad study habits that some people tend to have, and as a result, their grades will suffer.
If you really want to improve your grades and continue to do well, changes are imperative. Changes such as, setting goals, going to class, organizing, and developing time management skills are some examples of good study habits. Although good study habits are harder to follow, with discipline and dedication, you are closer to good grades and endless possibilities!
If you're having problems with a particular subject, getting a tutor is important. Your options aren't limited on the West Coast; in fact, there are plenty of great tutors. For example, there are plenty of math tutors near San Jose that can help you make the grade to keep your GPA where you would like it. In addition to that, nearly every student who plans to pursue further education should consider getting an SAT tutor in the Bay Area, San Diego, or LA.
As with anything, it's important to be resourceful and self-aware. You can only succeed if you recognize where you need to improve and take the necessary measures to do so.