How should i keep my grades up and not get bad grades?

Well, first off, oneral?

Study, study, study! A tip for studying: Every 30 mins. you study, take a 10 minute break. This helps to keep your brain fresh. Stay organized, and write down all your assignments. Figure out what you are doing each day. If you are doing really bad, ask the teacher for some one-on-one time, or a tutor. Occasionally, get some friends together to study for the big test. You can motivate each other, and quiz each other. Make sure you actually study though, as study sessions can quickly turn into parties.

well first, study, don't goof off in class, get the work done, and put effort into it. read books, i read tons of books when i was younger 6-11years old. and i have a great vocab and i can spell very well now and i think that is why, so apply yourself, and you have to put in more than the minimum effort...

pay attention in class actually study and and do your work hope i helped :D

keep good study habbits such as come home from school eat a snack do some hw shower do some more hw eat go online and stuff then do a bit of hw right before u go to bed so u dont forget