If I'm willing to give iit mains exams n can give only at one center then is is possible

It is not necessary that you will be allotted a particular center that you have filled but the jee advanced authorities will try to allot you that center only which you have given maximum preference to and in most cases that center is only allotted but some times due to heavy rush or more people applying for same center it may not be possible that the same center will get allotted so they will allot you the subsequent choices although they try to give you most preferred center

Dear Pranav,

Yes, it is possible that you give the JEE Main exam at one centre. However, it is advisable that you opt for more than one centre to be on the safe side while filling the application form of JEE.