@Onetimequestionmaybe,
Have you spoken with your teacher? What does s/he think? Is the teacher willing to give you some extra help?
If the teacher is unwilling to help you then I would say drop out. For the main reason that you are not going to learn it as you should - good teachers are very willing to have students - and often times, the teachers will be more lenient on your grade if you show an honest to goodness effort.
Math is cumulative in learning so it is important to learn the material. It will continue to haunt you gpa-wise if you do not learn the material.