Don't confine your learning only to schoolwork.不要把自己的学习只局限于课堂。

动词词组confine...to...，把……局限在……之内。
　　例句：
　　He is asked to confine his use of the telephone to business calls alone.
　　他被告知，只能用这部电话处理公务。
　　They managed to confine the disease to a small area.
　　他们设法将疾病控制在小范围之内。