Lucky for you, there's a lifeguard on duty (aka me) who can help save you from your pool of stress, anxiety, tears, papers, psets, labs, quizzes, midterms, and everything else teachers could possibly throw at us.
Before you freak out even more, think about it this way-- you're life is so long that one test is not going to mean anything to you 10 years from now. Truly. If you do poorly on one exam, laugh it off and learn your mistakes because everybody (and I mean everybodyyyyy) has failed at least one exam in their life. So, don't think of yourself as "stupid" or "unworthy" because of a low number on a piece of paper. You are more than a number.
What I enjoy doing when I'm stressed is take naps. Think of naps as battery chargers. When you are running low on battery, you will move slower and be less efficient. After a power nap, your mind will be re-energized and life will be easier.
Speaking of efficiency, here's the biggest studying tip that you will ever receive: WORK SMART, NOT HARD. If you sit at an ugly desk, staring at words on a page for 6 hours, I'm not sure how much of all that information you would actually end up processing. Professors most of the time will not test you on every single detail, so it's best to skim through your readings and find the key points of information. Then, memorize the key points. This will cut down your studying time in half and heighten your efficiency.
Lastly, while you're staring at your pile of work, keep telling yourself: it will get done. If you keep re-instilling confidence in yourself that you will complete everything, then you will. Many before you have graduated from Wellesley successfully, so you will get through this period of stress and will graduate successfully too. YOU GOT THIS!