I take it you're a 2L? If so, one way you can improve your GPA is with good class choices, i.e., in which either an A is easily attainable, or you can get a B with no effort, affording you more time and energy for your harder, required classes (unfortunately, this applies to all of your classmates, so it's not always the source of huge class rank gains).
Assuming you're required to take business organizations/associations and evidence, and in the event you choose courses such as trusts and estates, securities, tax, admin, etc. (i.e., in which you'll likely take an in-class exam), the same study rule should apply going forward that applied during your first year: don't study "hard," study "smart."
Studying smart means different things for everyone, but in general, always ask yourself: Is what I'm doing going to help me do well on the exam?
So much time and energy is expended by 1L's so that they can perform well in class. They slave away, trudging through and briefing case after case, held hostage to the fear that they could be "called on" in class to recite, in absurd detail, the facts of a case, along with the holding and reasoning (and while facts matter, many professors do seem pointlessly caught up in the facts). The skills developed throughout that process are indeed necessary (for exams and for practice), but they're developed within the first month or so of law school. After that, students should stop fully reading and briefing cases (instead book briefing, if at all), focusing instead on the march to exam time.
For the courses in which you received disappointing grades, how much time did you spend taking practice exams (your professors' old exams and/or commercial prep materials)? You can know the subject matter cold, having memorized every rule, but come exam day, that's useless without having prepared to perform.
Do you know what professors do when they call on a student in class, and that student fails to adequately present a case? NOTHING. Though many state that they'll raise or lower grades based on preparedness, I think it's rare that they actually raise grades for students who routinely knock it out of the park in class (though they do it occasionally), but I've not heard of anyone's grade having been lowered for being repeatedly unprepared for class (one logical reason being that, in such big classes, people are only going to get called on a few times a semester; another reason is that raising/lowering a grade would require the prof to do extra work). Students can be drooling idiots in class, but if they memorize an outline and PRACTICE writing out answers, they can do well on exams.