Is their any kind of restriction on full sleeves shirt?

no there isnt any.

there is no specific dress code for jee main

but considering factor of safety, you should avoid wearing long sleeve shirts and shoes.

here is no specific dress code this year in JEE MAIN . But i suggest you to dont take these things along with you in exam :—

1. First of all, all types of electronic item (wrist watch included).
2. No stationary(no pens, no pencil).
3. No belt, so wear tight pant.
4. Tshirt with some Design on front and back.
5. Any type of bracelet.
6. Biggy shoes..
7. Any water bottle.. (but i take a cold drink bottle along with me)
8. Purse……

Keep these things in mind. Full sleeves are allowed anyways.

CBSE has not specified any dress code for JEE Main 2018. However, some pointers are wise to keep in mind regarding what to wear and what not to wear to the exam hall.

Do not wear anything with too many pockets.

Do not wear jewellery.

Wear simple, clothes without accessories.

Preferably wear t-shirt and jeans

For JEE Advanced 2016, a dress code was introduced for the examinees. However, for JEE Main there was no such implication. Same happened in 2017, there was no such restriction for JEE Main 2017. So, those appearing for JEE Main 2018 can wear whatever they wish but it should be comfortable. To be precise, there is no dress code for JEE Main 2018.