Since you are on fin aid probation, you have to meet the terms of your probation before you can continue to get financial aid.
Simply put:
If you drop OR fail, you will not likely get any aid at all after this semester. This is a serious matter. You need to contact the financial aid office and very specifically tell them how many hours you are enrolled in, tell them you are on probation for failing and dropping classes, and find out what will happen if you drop a 3 hour course and also what will happen if you drop 2 three hour courses.
I will almost guarantee that if you drop even ONE or fail even ONE - you will not meet the terms of your probation and you will loose the ability to get any kind of aid in the future. This includes grants AND loans. Probation has a minimum overall GPA requirement (ASK THEM WHAT IT IS!) and minimum # of hours requirement. (ASK THEM WHAT IT IS!)
You may discover that even if you get all B's in every one of your current 15 hours you can't get your cumulative GPA up high enough to get aid next semester no matter what. All A's in all your courses may get you over the top to get aid, but if you drop any of them you will NOT fulfill the other requirements of NOT DROPPING COURSES - which is what put you on probation to begin with. (Your GPA is a 0.0 right now it sounds like. Figure out how to calculate GPA's and do a few scenerios.)
So.... unless you want to sit out of college until you save enough money to pay for a semester or two on your own, I'd suggest you study harder, hire a tutor, and start a study group for those classes you are struggling with.
THIS is how you keep your GPA up, not by dropping classes. You drop classes when you are in a horrible car accident and have broken every bone in your body and they won't let you out of the hospital. You don't drop classes because you are afraid you will fail.
When it comes time for you to find a job after college, future employers will see those W's on your transcript and frown.... it may even prevent you from getting an interview.