Hello,

First of all i would like to tell you, anyone can have a good future.

Marks are just a way of showing the people and to get admission in colleges.

They don't heelp you in life. Your talent beats all.

if you are talented then no one stop you from being successful.

You can enter a good college with CSE  branch if you have aced the entrance exams.

Don't worry if you haven't beacuse as i said if you are worthy enough then any company will pick you.

As you are interested in CSE, I would suggest you to start with the concepts and learning a programming language.

Start learning C, Python etc as these  are very basic and easy languages to start off with.

Start learing more about data structures and algorithms as every company has asked a question on that as its very important.

There is a lot more and it's a long way. It's just your hardwork and persistence that will help you.

If you have any queries feel free to comment. I'll help if possible.

Hope this answer helps you and all the very best for your future! 

Hello Jaya
You can get the good College even you got the less than 75% you can write the JEE mains in that get the good score then you can get the NIT college and as well as IIIT'S also
One thing do hard work then you can do anything in this competitive world
And also you can write other state government conducted exams also
All the best