hey rekha 

to get admission in aiims you have to give aiims entrance exam which is conducted by aiims itself. they do not select candidate on the basis of neet score. if you have given aiims medical entrance exam and you expect you good score then only you should prefer aiims. otherwise 558 marks in neet are quite good score you can get govenrment medical college in state like karnataka, up, telangana, maharashtra etc. 

goodluck