Hello Aspirant,

No not at all, if you have been allotted a seat in Mechanical engineering and if you do not like the institute in which you got the branch so you can choose FLOAT option during JOSAA counselling which allows you to upgrade your seat and also the seat you have been allotted earlier will be reserved for you.

For complete details about JOSAA counselling kindly refer to the link given below :-

https://engineering.careers360.com/articles/josaa-counselling

I hope this information helps you.

Good Luck!!