Just do these simple things
Yes provided no higher amount of penalty due to prepayment. If you're able to save 5-6 lacs by payment of 1 lakh penalty then i must say go for it and also it won't impact your CIBIL score
For early payment of loans or pre maturity payment of loans other than construction purpose you have to pay foreclosure charges. After 12 months such charges is approx 3% Plus GST 18% and you will not be liable to pay interest for remaining term. Just apply for foreclosure and pay the amount as calculated.