Hi Raneem. I have re-written your essay in correct English form:

How can you improve your grades? There are many people that do not know how they can improve their grades, so I will discuss it with you in this essay, there are two solutions, first you should study every day, and second you should not miss any classes.

Firstly, you should study every day. Actually studying every day is good for you, it has many benefits like it makes you remember all your lessons and you can do an exam at any time without studying, so it makes your studying easier for you but how can you study every day? First of all you should attend school, it helps you manage your time and organise it. In addition when you start to study you should start with the easiest subject and also you should take breaks to rest your body and your brain. This is the best thing to improve your grades.

Secondly, you should not miss any classes, so if you miss a class, you will be in trouble, because you didn't just miss your lessons, you will be losing your marks so you should attend all your classes, moreover if you do attend your classes you will understand all your lessons and also you can share with your teacher to get marks, so you should be more responsible and I like this solution.

Finally, these are the best solutions to improve your grades, in addition if you try it, you will see how your grades improve, you will not find any of your lessons difficult, and it makes you memorise all your lessons, so it is very helpful to you, and I wish you all the best in your studies.

I note I am English and therefore I have corrected your spelling on 'organise' and 'memorise' because you have spelt them the American way - if you meant to do this that is fine, I just wanted to make you aware!