After Being Forced to Transform into an Ancient Disaster Star

[One sentence introduction] On the day after the college entrance examination, Song Jin was thrown into the cannibalistic ancient times by a pop-up window that could not be closed. When death becomes a luxury, she can only pick up the only weapon - high school physics knowledge, and write a "Self-Rescue Guide" for herself in a desperate situation in this strange world. Complete introduction The next second after pressing the submit button for the college entrance examination application, Song Jin's computer popped up an advertisement that could not be closed. When she opened her eyes again, she became the "disaster star" in the ancient village who was about to be sold to the tuberculosis ghost for happiness. When she hanged herself, the hemp rope rotted and broke; when she threw herself into a river, the inexplicable undercurrent pushed her back to the shore. In this world, even death has closed her authority. Those time-travel novels that "you can go home after you die" are all lies. Only the cold river water and the pain cutting into the flesh were so real and despairing. When the physiological desire to survive finally crushed the thought of seeking death, Song Jin wiped his face and began to solve problems calmly with the thinking skills trained in his senior year of high school: 1. Known information: I am 18 years old, a candidate for the Physical Science and Technology Examination. I am physically weak and have no background. I live in a feudal agricultural society. 2. Unknown: reason for traveling, method of returning home. 3. Solve: How to maximize survival before (1) (2) is solved?