Feeling low, having crying spells, sleep and appetite disturbances, and difficulty in concentration and attention are some of the signs of Depression. Consult a Psychiatrist for a detailed assessment. It is likely with medication and counselings the symptoms will improve. If you are feeling suicidal or hopeless consult a Psychiatrist immediately.

U are still 24. People start their career much later than 24. Some even at thirty There is no reason to feel depressed. Focus on your exam by repeating positive affirmations - I will do well in my Railways exam - 10 times, thrice a day