Engineering Entrance Exam

KCET is only for the Karnataka students and PESSAT is for all other students. Even Karnataka students can sit for PESSAT. The last date for applying for PESSAT was April 10, 2018.
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You can do engineering in Coimbatore from CIT, PES, Karpagam, Kumaraguru, Hindustan, SNS, etc.

If u want higher education prepare JEE, if u like normal education mean go with hsc.

You can get mechanical, electrical, civil and biotechnology for sure with this rank. You can wait for the second round and try your luck for other higher branches.
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Go for KIIT University. It is the best private university.

No, till now, it has not been combined. This year also, the JEE was conducted in two phases only that is JEE Mains and JEE advance. The notifications of any changes will be notified on the official site of JEE Mains.

No, you can't do that now. Once the form is submitted and the examination is conducted nothing about the changing can be done, unless it is done during "form correction" procedure. The form correction process comes many days before the examination. JEE advance offers the last chance to correct the basics incorrect details. But still, the category can't be changed.

Well, this is against the rules. There is no provision of attaching the certificates and making any amendments after the examination has been conducted. You should have uploaded the certificates along with the form at the time of form filling and payment. You will be regarded as general candidate now.

Well, you need to go for the standard books for JEE Advanced which includesu201d
-IIT mathematics by Das Gupta, TMH Publications
-Numerical chemistry by Prakash Bahadur, TMH Publications, Solomon and Vryles for organic. -IE Irodov, TMH Publication for physics. I hope it helps you. Prepare well and solve the past years papers from MTG publication.

It is not possible in normal rounds of JOSAA but just give it a try. You may get a seat in spot round in any of the IIITs.