Permesso question

Hello all!
I'm a from India. i was studying in Italy. i'm having having long term student Italian resident permit for 1 year and i was doing renewal every year.

I'm having a some doubts regarding permesso di soggiorno kindly please guide me.

1) Maximum how many months can i stay in India. If i stayed more than 6 months in a year in India will it effect my Italian resident permit.
2) I was thinking to come to Italy for every 5 months in order to attend my exams in Italian university. Is this possible?.

Thank you!

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