What's the point?
Now you may be wondering, who cares about school? Who cares about my marks? You're probably even thinking that schools useless and you'll be more successful dropping out.
You're basically thinking anything but the truth, or in this case, my opinion. School is the most important aspect of your life right now, and I congratulate you for taking a step in the right direction and reading this article. Let's get to the facts, you can't even work at your local McDonalds without a high-school diploma, simple as that. The best job you could get is a labor job, but I doubt you would enjoy doing it for the next 60 miserable years of your life. Day in, day out, same thing every single day. Face it, if you keep going the way you’re going (I'm assuming your flunking) your life will become this, a miserable mess.
Who cares about your marks? Hmm, let's see. For a moment, imagine your dream job/career/life. Now do you think that's possible with failing grades in every subject? There are probably two reasons for this: first, you don't know how you learn, I'll get to this later. Second, you don't care about school. You won't even be able to get into a college with low marks, and if you passed college with those marks, not many people would want to hire you compared to all the other more motivated people out there. Obvious fact.
School is the most important thing because not only does it teach you "stuff" but it prepares you for a life of learning. You never stop learning. You learn so much from school. "Knowledge is power".
If you read this and think you'll end up like Bill Gates, think again. Bill Gates was a very determined person and strived to achieve his goals. He created programs back then using BASIC. You may not think that's much, but back then there wasn't as many resources as there is now to learn, as well as he had limited hours on the computer at school. Bill Gates himself advises people not to drop out of college like him. He actually loved college, but he thought it was a better choice to drop out and start work with computer chips, and he was lucky.
There are so many people around the world who want nothing more but to go to school. Put yourself in their place, being forced to work as a slave and denied education along with the harsh conditions. Now think about your position, in front of the computer with all of the information you ever need right at your fingertips. Why don't you attempt to go for your goal, you already have everything in front of you. It's like, you have a paintbrush and a pallet in front of you, all that's left is to draw out your life. You make the decisions, and let's just hope it's for the better.
Simply put, if you don't want to be on the streets, I'd suggest you give some importance to school.
If the previous text didn't convince you at all, then I suggest you have a break in your room or bathroom and think about life. If you managed to grasp the concept of schools importance, then the following ideas to motivate you will stick.
First, you need to love what you're doing. If you don't love to learn, you better figure out why. Why else do successful people love what they're doing like Steve Jobs or Dave Ramsey? Do you think Steve Jobs just built computers because he was bored? He loved to make computers.
Next, you need to have fun learning. You can't expect to get a perfect score if you're not interested. Spice it up, make it so it's interesting for you. Whether it be acting it out, writing an essay on it or even drawing something about it. 
I suggest you watch this video, it's quite inspiring.
Look at this picture. What does it tell you?
Simply put, you have to be determined for your success. You have to believe you can do it, and that's the only way you can be successful.
Protip: Become a self-directed learner. If you like programming or any computer software/language head over here. For everything else this is brilliant. This is the difference between the intelligent and just average people. Life is short, so you might as well use it to your advantage.
Dealing with procrastination
Procrastination: the act of procrastinating; putting off or delaying or deferring an action to a later time.
For starters, food. You need that well deserved meal. I'm not talking a bag of chips. I'm talking steak, bacon and eggs, homemade burgers, simply large filling meals.
Next, what you need is some music, classic baroque is proven to help you focus.
Now what I recommend is, making a schedule.
Say: Study for an hour, take a break on 15 minutes, study for half an hour, take a break on 10 minutes.
*It's okay to procrastinate for longer than you're studying AS LONG AS YOU STUDY WHEN YOU NEED TO. If you find yourself watching TV when you're supposed to study, you're doing it wrong.
Also, it's important that you award yourself, you just wrote a damn nice introductory to your paper? Take a breather! Step away from the computer, take a walk outside! Tell your mother to bake you some cookies!
Now, everyone procrastinates, you're gonna be finding yourself watching silly cats, failblog and whatever the weird side of youtube has to offer. And you're gonna be like "Wait... Weren't I supposed to study? Oh well, whatever" And then you're gonna forget all about it, the reason for this is that your most likely not in the mood for studying.
All these things will help you get in "The Zone".
This is not about minimizing procrastination, but taking advantage of it. 
Procrastination is a common problem for most people. What I suggest (Adding to the previous text) is that you set goals for yourself, and write down what you need to do on a sticky note. Then check/cross things off the list once you complete them. Makes big things feel like nothing as you accomplish each small portion of it. It makes you feel like you accomplished something.
Also, I don't recommend energy drinks, there are healthier alternatives. Nuts, apples, whatnot. Protein = Boss, which is better then caffeine in my opinion.
A great article on this is this:
What I do to study for things is quite simple; keep the things I need to study to a minimum.
I learn a lot actually by asking questions and debating on the topic. I learn quickly, but this gives more meaning to it. I want to always win, and a debate about the topic is just the way for me to go.
Protip: Figure out how you learn. Use this.
Take the short quiz and find out how you learn. If you know how you learn, then learning isn't a problem anymore.
This is what I do:
"Go to my bedroom, put on some relaxing music, read all the things I need for the test, make my own test to test what I know and what I need to understand, take some breaks every one hour of studying (It helps a lot, but don’t use that break time to stay on the computer, go outside take in some fresh air, eat something good and go back to study again)"
Before you enter the class I would recommend to calm down don’t take it like a seven head monster, take your time don’t try to finish it quick, read all the questions all over again before do them. 
There's a teacher who actually put up a series of video's of things he wants his students to know. There's quite a bit of brilliant material in here, and I suggest you check it out.
Here's a fantastic article with even more "secrets".
That is all. I hope you liked my article and it helped you out. If you have any questions, comments or suggestions, don't hesitate to post below.
I know that was alot of reading, but ask yourself, do you think you're going to be more successful after reading this?