My Saintly Sister Gave Away My Early Admission Spot

My twin sister was overflowing with saintly compassion. With the college entrance exams just around the corner, she disguised herself as me and gave away my guaranteed university admission. She said my grades were good, so I should leave the opportunity to a classmate who needed it more. Furious, I decided to settle things once and for all at the exams. In the end, I finally made it into the exam hall, only to completely bomb the tests after losing my composure. When I opened my eyes again, I was back on the day I received my admission offer.