The most important thing to consider, this is not going to happen over night.
If you want to improve your habits, however, I suggest the following:
Work with your teachers. Ask questions and ask for help and ASK. Never be afraid to look stupid. I promise that if you ask when you're genuinley confused, your peers will be thankful and think you're smart and dedicated.
Don't be distracted in class. Don't text or talk unless it is a specified break and you have nothing else productive you could be doing. Even then, you could be reading; just in general good for so many things.
3)Do your work and homework. Tiny amounts of points over a large amount of time mean more than the tests you're going to fail from lack of practice.
If you need to take notes, do so. If you have a 2.5 GPA, it sounds like you need to. Cornell is the most highly suggested note taking strategy. It is done by drawing a line a little less than halfway across your paper, leaving a few lines at the bottom empty. Title and date go at the top, the main topic goes in the left and the details for the topic go to the right of it. The last few lines of the page are used to make a summary of the entire page, which can be looked over later (see 5). There is also an outline form of notes where you put the details underneath the main points. Use whatever works best for you. If you're a visual learner, maybe you should draw the concept. (This is also effective for flashcards).
Don't cram. Study over the entire year; look over the notes of the previous day before and after every class period. Memory is gained by HUGE amounts of repetition or through emotion and motion. Repeating over and over and over is called rote memorization. It can be effective, but not ideal. The alternative is connecting a concept with an emotion or surprise. If you think of something you didn't expect with the concept it is easier to learn. In chemistry in my juinor year, I called lead "peanut butter lead". This was to remember the atomic symbol for lead was Pb. It was one of the symbols I knew best the whole year.
Supplies and Organization. I ruined my freshman year of high schools grades by not being organized. I tried to use a big binder for each class, it resulted in me often bringing the wrong binder to class and not wanting to bring it home. The binder itself was even worse as I didn't bother putting each paper into the correct section at the earliest opportunity, so I stuffed everything in the first front pocket of the binder. I lost everything that way. Even if I did the homework, I couldn't find it or forgot to bring it to class. Now, 5 years later I use a folder system. Each class gets one folder, and in each folder is some loose leaf paper. One side of the folder has papers that I don't need to turn in, that I keep for myself. The other side has anything I need for the homework, and then ready to be handed in homework by the next class period. I also had a sprial for each class that needed notes. Your backpack should also always have pencils, grading pens (blue, red and black are the basics), a calculator (based on whatever math you're taking, Ti 85, 'baby' etc.), sharpener(if you use wooden pencils), an eraser, and highlighters(optional. Underlining works just as well with less chance of going overboard), CHEAP pencils(on top of whatever pencils you decide to go for, have some cheap ones to lend to people that you don't mind never getting back.)
Food and drinks. If you are allowed to eat and drink in your classes or the hallways, be stocked up. Have a water bottle. Water has been proven to reduce stress, increase metabolism and just be generally good for you. Snacks: choose something healthy, please. Especially if you don't eat breakfast (which is stupid, eat breakfast.). You may as well have gum if you're allowed, but be prepared for everyone to ask for it.
Eat breakfast. Most important or not, it is important. Billions of studies on why you should eat breakfast. Just do it. Time cannot be a big enough issue for you that you can't take 5 seconds to have something. I eat yogurt and a cereal bar in the car while my mom drives me to school every morning. Make it a priority. If you absolutely cannot eat breakfast, bring something filling to eat at school. If you tell your first hour teacher about your circumstances, they will probably let you eat your snack. Unless it's science, and you'll have to eat in second hour. (Chemicals getting into your food is bad, science labs have this rule for a reason.)
Coffee and sleep. Caffeine is bad for you. It just is. Energy drinks are even worse than coffee. Try to cut these out and regardless of how much sleep you get, it will be better quality. 8-10 hours of sleep a night is suggested. That probably means going to bed at 10pm. Which is unreasonable in today's society, I know. Just get as much as you can. Naps are perfectly acceptable if you cannnot sleep the amount all at once, but getting your sleep in chunks isn't good for memory retension, which is kinda necesarry for good grades, so keep that in mind. Sleep also lowers stress, which is nice.
Think about what is making you struggle. Is it lack of organization? Lack of motivation? Whatever these things are write them down and write some solutions. Motivation can be solved by writing your goals for school, which you should do too.
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