Exam

You have the required marks for admission and also required IELTS marks, if you apply directly you can get admission. You can also apply through some education consultants, they will get admission and also they will process your student visa and give you. You have not mentioned your area of study an

It depends upon the exam and the course you are applying for. Since you have tagged Mass communication, I am assuming you are interested in it. Basic level Maths up to class 10th comes in every exam, be it HM or BBA or your Mass Communication.
Topics like percentage, ratios, time and speed come up.

Yes, you can appea. All exam are conducted on different days.

Yes, but its depend upon college time table.

Join any private Engineering college and improve your skills.

Refer the official website to know the complete fee structure -
https://www.nitt.edu/home/academics/fee_details/.

Ask to the admission cell of your college and then clear the medical entrance exam, and then you can get your seat.

At least, you have to score more than cut off, so that you can get best college.

Of course, you can apply for JCECE. No matter from where you have passed your class 12th. But, when you are filling form of JCECE, you have to mention about your domicile state.

Hi Pranitha!
You can refer to this link to see the previous years' cut off lists and have an idea where you stand in the admission queue https://www.shiksha.com/design/exams/nift-entrance-exam/cutoff.