Going to college after graduating from high school means going to college after taking the college entrance examination that year. Instead of going to college, you chose to sign up for the army. Through physical examination, political examination and other links, you are approved to join the army, and then you can apply to the university for retaining your student status with relevant procedures, such as the notice of enlistment, the notice of admission, and the application for retaining your student status. So that you can go straight back to the university to continue your study after two years of military service. The time limit is within two years after discharge. If some schools refuse to handle it, they can find a recruitment office to coordinate.