问题
填空题
Crammers can improve their grades by adding informal ______ before the overwhelming pressure is on.
答案
参考答案：study sessions。
解析：[题眼] improve，grades
根据题眼定位到第九段，第四句对考前用功者的忠告：Improve your grades by adding casual study sessions before you hit high-stress mode．(在高压来临之前采取增加非正式学习课时的方式来提高成绩。)题干中的informal是对原文casual的解释。