Thanks for the query.
There is possibility of dehydration
due to improper intake of water during exams.
You may be having hemorrhoids or anal fissure
Better to consult gynecologist or gynecologist and take:
and analgesic ointment
Along with this you have to take plenty of water, fruits, vegetables etc.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429