JEE

Yes, you are eligible to get the admission at Chitkara University, Himachal Pradesh with the mentioned JEE Mains marks and as you expected marks in boards. Counselling will take place once JEE and class XII results will be out. You get yourself registered with Chitkara University by filling up the form. Forms are available in various book shops and you can also apply online at - admissions.chitkara.edu.in.

No. You should go for private colleges.

It depends from person to person. I personally believe that you should definitely drop for JEE. You know you are afraid that you may lower your marks, which has a very low probability of happening. But if you drop and do well next year, you could easily pursue CSE, which you have always wanted to. And let me tell you, my friend, if you give your 100% next year, you shall get CS. You just can't let your fear stop you from trying. If now you let your fear stop you, then you are in a big trouble. Don't even think about marks, just go study.

Hi Pravan,
Percentile that has taken into consideration for appearing in JEE Advanced tends to change every year and varies from boards to boards because it is calculated based on the highest marks scored in the examination.

Of course!
For private universities, you don't need to write JEE Mains.
I hope it was helpful.

The last year cutoff for OBC category was 70 Marks but this year, JEE Mains has not released any cutoff as of now. So, wait for the cutoff and if you want to take admission in a good NIT, you have to score more than 140 in JEE Mains.
All the best.

Dear Rahul,
With the marks of 77, you are qualified to write JEE advance if you are a reserved candidate but if you are an OC candidate then you are not qualified to write JEE advance. The marks 77 are not enough to get a seat and from this year, the board percentage is also not considered. So, better go for other options and try your level best.
All the best.

You need to secure a rank under 7000 to get admission in IIT.

Syllabus is totally different. It totally depends on you whether you want to go in service industry or in engineering. I advice you to think more, get information about both the things and then decide. You can post more of your doubts. Good luck.