Siheyuan: I am invincible with my portable space

Chen Yu'an accidentally traveled through time. It was unimaginable that he actually traveled to a world full of beastly behavior - Siheyuan, and immediately moved into this beast's den with his sister. Fortunately, Chen Yu'an's "proficiency sign-in system" awakened. He can get rewards by signing in every day, and can continuously improve the proficiency of his various skills. In order to ensure that he is not calculated by the beasts in the Siheyuan, Chen Yu'an began to madly improve his cooking, medical skills and other abilities, and made an important decision - to take the college entrance examination! When the beasts in the Siheyuan learned that Chen Yu'an took the college entrance examination and became the national college entrance examination champion, one...