Is it mandatory to stay for 11 months in a rented house if the Rental Agreement was made for 11 months?

If you are staying for less than 11 months, then it depends on the Rental Agreement you signed with the owner of your rented house. There might/will be a clause in the Agreement like you must stay for atleast 8 months or so, if not, then some amount (generally one/two months rent) will be deducted as penalty along with other charges mentioned in your Agreement Otherwise you could always request the landlord to break the lease without major loss to both parties.