Hi,

Assuming your son's AIR rank is 14757. Following are the opening and closing rank of NIT AP for Home state students:

Bio Technology - 30535 -  46769

Chemical Engineering - 34018 - 45143

Civil Engineering - 32298 - 43088

Computer Science and Engineering-  5652-  14075

Electrical and Electronics Engineering - 21694-  31123

Electronics and Communication Engineering - 14279 - 21156

Mechanical Engineering-  17656 -  33173

After taking previous year cutoff in consideration, your son could get any branch in NIT AP if cutoff remains similar to previous year.

In order to know what other colleges he could get, try this tool : JEE Mains 2021 College Predictor

Thanks!!!