Engineering Entrance Exam

No, you cannot get it. But you should at least fill the counselling form. May be you get any college if any seat remains vacant. Otherwise There are so many good colleges, Please try for them. I personally suggest you to fill the form for the Nirma university. According to JEE marks and 12th marks, You can get admission in it. Please try for it. It is the top 29th ranked university in India among all the IITs, NITs and others.
Thanks.
Keep asking.
Keep smiling.
Be kind.

Firstly, please don't worry. As your marks are not the only parameter to judge yourself. As per your marks, I think you need to re-strategise your career plans. If you are not interested in maths or did not have enough command in maths, so I suggest to move in that field in which you have both the command and interest as well.
Best of luck.

Yes, there are 3 chances for the JEE Mains. One of which is with 12th class and other two chances are given to you after 12th class. And there are only 2 chances for JEE advance one of which is with 12th and another one is after 12th. You should try again, If you are confident that you will cross the cut off next year. Otherwise leave it, There are so many good colleges in India. You should try for them. And see, If you have talent and skill, Nobody can stop you in your life for succeeding. Colleges does't matter if you have talent. All the best for the bright future.
Thanks.
Keep smiling and keep asking.
Be kind.

I can't just simply mention a specific site to get answer key. You can simply search for it on internet.

Sr. No. Programme Name
Opening Rank
Closing Rank
are given below
1
Computer Science and Engineering (4 Years, Bachelor of Technology)
418
879
2
Electrical Engineering (4 Years, Bachelor of Technology)
1393
2079
3
Mechanical Engineering (4 Years, Bachelor of Technology)
1430
3401
4
Engineering Science (4 Years, Bachelor of Technology)
2674
4603
5
Engineering Physics (4 Years, Bachelor of Technology)
4255
4836
6
Civil Engineering (4 Years, Bachelor of Technology)
3804
5300
7
Chemical Engineering (4 Years, Bachelor of Technology)
3903
5869
8
Materials Science and Metallurgical Engineering (4 Years, Bachelor of Technology)
5389
6844.

Dear Shivam!
You need to do two things, #1) If you are on Phone. Go to settings, and click 'unknown source'. Tissue will really your system on any unknown link. But might be able to open. #2) If you are on windows, update that. Because these Web pages are only compatible to Windows 8 and later. If still problem persist. Immediately contact the university itself. Good Luck.

To book slots, you have to log-in to the SRMJEEE 2018 slot booking portal using their application number and password. Upon successfully logging in, the candidates can book a slot from the available options. The admit card of SRMJEEE can be downloaded immediately after successful SRMJEEE 2018 slot booking. Go through the link for complete your slot booking process
http://www.srmuniv.ac.in/announcement-SRMJEE-Slot-booking.

From which category you belong to? If you are from OBC NCL, then there is a little bit chance of getting government college but the branch you've got in such college is not as per your choice it is as per availability of seat in that college in any branch.

Yes, he/she can. But one should be thorough with the whole NCERT book. If it is done, then almost the syllabus will be covered. To score better, one can refer additional sources.

On basis of these marks, you can apply directly in any private college. And in the some of the state, you can fill up the counselling form through which you will get college according to your 12th percentage and JEE Mains marks. Just like there is an Counselling process in Rajasthan I.e. REAP through which you will get a college all over the Rajasthan according to the rank or your marks. Similarly, Every state do have same type of counselling processes for the admissions. Hurry up.
Thanks. Keep asking and keep smiling
Be kind.