Need guidance

My son will be moving to Class 11th in couple of months. He is aiming to get admission to NIT or state colleges like DTU

Few queries

-He will be joining VMC NSP from April 2026. It’s a 2 year classroom program

-Should he join a dummy school or can he continue with his regular school which has strict attendance policy of 70%

-Is VMC good for jee mains as he doesn’t wants to focus on JEE advanced

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Any pointers will he helpful