Hello Friend, thanks for reaching out here for help. I can understand the stress that you are going through now. Don't stress too much. 8 days without sleep is not good for health!!. It's not adviced and it will create other complication later. Look like you have time management problem. Take advice from friends or family to overcome. You may need a small counselling sessions to get guidance.
Next Steps
You can even avail counselling services if available in college. If not or if can't afford, reach me, I can connect with people who provide this as service.
Health Tips
Consult your friends or seniors for help, if you are worried about subject or doubt. Prepare a time table based study schedule. Give time for sleep. Have a glass of milk before sleep.