Yes unique question papers from 2019 for each candidate by NTA as against earluer where there was fixed questions paper. 

List of all new rules shared below and implications of it. 

https://engineering.careers360.com/articles/jee-main-2019-unique-question-paper-for-each-candidate

Hello Saurabh,

Since JEE Main 2019 will be conducted by NTA, the exam pattern has slightly been modified. The exam will be conducted through Computer Based Test. As told by NTA, there will be lakhs of questions prepared by the professionals and will be stored in the question banks. The software which will work on Artificial Intelligence will select the questions at random from the question bank and the difficulty level of the questions will increase as we move further to the next question. Also, you will be able to get back to the previous question whenever required.

Please feel free to comment below for further assistance.

All the best!