I've completed my 12 th and BE Cse. I'm about to apply for SSC CGL . I saw a column called roll no. I'm from Tamilnadu and studied in State board. I don't have roll no so what should I write in that column either 12th or college no. which number should be I write
CGL is a graduate level examination and I think they have been asking about the Graduation roll number may be or it can be for boards 10th or 12th.
I would request you to read the information bulletin or the instructions carefully as per SSC CGL & then fill it up. I wish a careful read will solve your problem.
I hope my answer helps. All the very best for your future endeavors!