Hello aspirant,

Yes surely they can appear for NEET as much as they want. They will not have to go through any special produres because of it. They will be given the same treatment as other candidates. The marksheets required will be class 12 only, and not theur college marksheet. 

Yes.

You can surely give NEET in 2020. You will have to follow the same procedure for the exam which includes filling the application form successfully. The forms for NEET 2020 will be out in december 2019. The exam will be held in the month of may 2020.

You should start preparing for NEET 2020 as soon as possible for ensuring that you get good marks and have better chance of getting seat in govt. college.

All the best!