Hi,
As you have no any other problems, you should not use it. Side effects are
insomnia, can be mood swings, decreased appetite. It will not increase concentration in normal ones. If you joined this online workshop [yes+] or youth empowerment skills programme [art of living course], they will give practical techniques to increase your concentration, confidence in exams without side effects.
To start
Ritalin,
psychologist [Barkley Home Situations Questionnaire or Wender Utah Rating Scale are to be determined] guidance is needed; 7-8 hrs of sleep. Eat lots of fruits, vegetables, salads, avoid caffeine, alcohol, junk foods, canned foods. Listen to the piano and nature sounds, they will help in memory retention.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Sunny Madar, General & Family Physician