Dear leaner,

According to nta , students who wants to take neet exam are required to select a code as per details of education ,the nta consider it as a major to support all students

General they have 7 codes ,but as per your question school coding comes under neet code 2

The students who are completed the whole period of 12 in one school under higher/ secondary both or ISCE students which is equal to 10+2 compliance must have passedout  subjects with physics, chemistry, biology, English in last two years comes under this code

And students from NIOS or state as private student comes under this code

Cbse /ise state board students who had already completed in 2018,2019 ,but wish to write neet in 2021 must apply for this code.

It is a option to choose and give details about which school you have completed previously

Here is the link about all the information regarding codes about neet . https://www.google.com/amp/s/medicine.careers360.com/articles/neet-qualification-codes/amp All the best.