One of my friends was in the same situation last year. He got IIEST Shibpur Metallurgy and Materials Engineering, Mining Engineering, and Civil Engineering along with a rank of 1383 in West Bengal State Merit List of NEET for MBBS admission converted with a mark of 462.
So, if you want to become a doctor and serve people and if it's the long-cherished dream of pursuing MBBS then you should leave IIEST and better prepare for NEET again. Different people will have different views regarding the decision of leaving a good college like IIEST but in the end, it completely depends upon your goals.