Memory issues at your age can be due to various factors - low confidence, attention or concentration issues, pre-occupation with interpersonal relation issues, lack of appropriate techniques of revision. 3-6 months of counselling should help you to a great deal. If the symptoms persist, you may require medications. Homoeopathy medicines help provide a long term benefit without side effects in such cases.
Next Steps
It is advisable to approach a counsellor at your college level for better guidance.
Health Tips
You may choose 30 minutes of any one activity - 1)Jogging on one spot, 2) Breathing exercises / Pranayam, 3) Meditation on instrumental music.