Great goal! You can do it!
My advice is to prepare for the stress of exams (especially final exams) ahead of time by stocking your fridge with low cal treats and healthy foods at least a week in advance. My biggest downfall is always around test time. I want to stuff my face with the least healthy foods I can find, usually fast food or pizza because they're more convenient than going to the grocery store. Over the summer, I prepared for that by stocking my fridge with healthy foods. I still ate bigger portions, but because they were low calorie foods, I was able to stay on plan.
My goal is to reach my goal weight - 150 - by November 4. Like you, I'm a senior. I graduate in December, so I want to start this next chapter of my life - the non-academic chapter - at a weight I feel good about.