do you have trouble staying focused? if so and you seem to have a short attention span or you find your self easily distracted then see if you have ADHD or ADD. if you do dont worry its not a disease or anything. it just makes it hard to focus or makes you hyper. they have medication you can take each day that helps you stay focused and calm. i drove my teachers crazy until i found out i had ADHD and i started tAking the medication.
Retake test,extra credit,staying after school,After school programs,studying and preparing for exams and the test that will improve your percentage and bring up your grade,tutor,study group,Making flash cards,online practice sites,places that help with homework other than your school If its getting close to the end of your 3rd trimester in school i would recommend going to your counselor seeing if you can take some online classes two. good luck =)