Hi dear,

Hope you are doing well.

Now let's go through your question.

From 2016, JEE came up with its new set of rules on things which will minimise the chances of cheating in the examination hall.

Pens and Water bottles will be provided by them.

Pens are provided because, now a days pens that have high potential to help candidates to cheat are available in the market.

Hope it helps!

Thank you& All the best!

Dear Tanmya, 

Since this year in JEE advanced you are allowed to carry black  ballpoint pen with transparent body, so this means they will not provide you the pen so carry it. 

And water bottle is prohibited in the exam hall so they will provide you water bottle. 

Thank u