As a US Citizen with an OCI card, you  don't require No Objection Certificates (NOC) from the Ministry of External Affairs (MEA) or the Ministry of Health (MoH) to study in India.

An OCI card grants you several privileges, including pursuing education in India without needing a separate student visa.

Since you already hold a valid OCI card, you don't need NOCs from MEA or MoH for educational purposes

Apply to the universities or colleges you are interested in and follow their admission procedures for international students.Once admitted, you might need to register with the Foreign Students' Registration Office (FSRO) at your university. They might guide you on any specific requirements.

I hope it helps!