Admission requires a test, and they are assigned to classes based on their respective cultivation levels.
Roger first took Lilith to the magic academy to line up, until Lilith completed the test and was assigned to a beginner class starting from scratch.
Then took her to the academy's accommodation, put her luggage away, and told her all the precautions of the academy, until he was sure that she had remembered them all, then Roger walked to the martial arts academy, looking back every few steps. If the two did not look similar and immature, people would really think Roger was Lilith's father.
By the time Roger arrived at the martial arts academy, most of the others had already finished the test. He didn't even have to queue up. After he went in and took a test of his fighting spirit, he was assigned to the intermediate class.