There are many options if you are PCM student. It depends on your interest & capability. Here are some of the options you can opt as per your interest.
B.E/ B.tech, B.Arch
If you are PCB student then you can go for MBBS, BDS & other paramedical courses like BAMS,

Btech in Biotechnology is offered at IIT on basis of PCM scores in 12th for eligibility and Jee Advanced scores. 

However she needs Physics, chemistry and Mathematics scores bove 75% aggregate in 12th grade. 

Cutiff forbtech Biotechnology at all IITs on Jee advanced scores below.

https://engineering.careers360.com/articles/iits-cutoff-for-btech-biotechnology

As per 2017 trends  you shall need ranks within 12855 in General category in GUJCET to get CSE at MsU Baroada.

For 12th grade you must score atleast 70%aggregate marks.

https://www.careers360.com/university/maharaja-sayajirao-university-of-baroda-vadodara/cut-off

You need to write as Appeared becaus eyou already have an attempt in 2018 year. 

All FAQs and applications form registration details below. 

https://engineering.careers360.com/articles/jee-main-application-form

Students must hav eobtained minimum 60%marks in Jeemain or Jee advanced for Bsc admission at IISc Bangalore. Students can simultaneously apply tgrough KVPY exam scores.

Entire eligibility and admissions process below. 

https://engineering.careers360.com/articles/iisc-bs-admission

Hello,

You should fill appearing in the qualifying examination. But, I would suggest you to contact the JEE officials about the same. I am providing you the details to contact the NTA authorities-

Telephone No. :  7042399520, 7042399521, 7042399525, 7042399526
Good Luck!

Yes, You can appear. As per the eligibility you should have minimum 50% PCB Aggregate score in class 12th as a general category & 40% as a reserved category. You can check the further information with the given below link.

https://medicine.careers360.com/articles/neet-eligibility-criteria

Good Luck!