Dear Student,

• We are here to answer all the legit queries and clear the confusions of the students but your question asks about the number of ST Candidates who have appeared in NEET 2019.
  
• The Number of Candidates who attended or applied for NEET 2019 is known to all by the source of media and NEET Authorities but What you are asking comes about category comes under confidential matter as that can not be shared is stated by the NEET Authorities.
• Thus that amount is known only to the NEET OFFICIALS and HIGHER NEET AUTHORITIES until the results are declared and all the admission process has been done.
  

I Consider that this has cleared your confusion.

GOOD LUCK!!