In order to apply for the Special Class Railway Apprentices Examination (SCRA Exam), first of all you need to fulfill the required eligibility criteria which is as follows:
Must have qualified higher secondary examination with atleast second division.
Must have studied Mathematics and Physics/Chemistry as major subjects in the +2 level.
Must have attained the age of 17 years and must not be over 21 years. The maximum age limit is relaxed upto 5 years for candidates belonging to SC/ST category and 3 years for candidates belonging to OBC category.