challenge exam造句

skim and review before class starts review is one of your best weapons against challenging exams
课前温习预习、复习是应对考试的最佳武器。
nsca-certified personal trainer certifications are the first nationally accredited certification programs in the fitness industry . awarded only after passing a rigorous and challenging exam administered by an independent examination service, the credentials are widely respected and internationally recognized
美国国家体适能总会-个人教练牌照是首个被美国国家所承认的体适能训练牌照，此牌照需通过严格的考核，并受一个独立的机关ncca所监察。
It's difficult to find challenge exam in a sentence. 用challenge exam造句挺难的