Hello Aspirant

A school allows its students to change their 5th or 6th subject in 11th standard even after they have chosen one. So, yes, you can change your subject from Hindi to Information Practices.

But, you can only change your subject till the time you have appeared for the first Formative assessment, i.e. if you have written the exam for that paper, you cannot change your subject because then the school has a record of your score and they cannot make you write the exam again when you decide to change your subject.

All you need to do is talk to your class teacher and the concerned subject teacher and tell them about your decision to change your subject.

Hope this helps