1.hit the books(开始用功)学习to study or begin studying very intensely informal
Richard and I are hitting the books. We need to study for the big exam.
理查德和我打算用功学习。我们需要为一场大考看书学习。
2.cram(为应考等)强化学习 to prepare for a test, exam, etc., by learning a lot of information quickly often+for
不过cram多是贬义，指的是填鸭式学习
It's more important for you to be sharp than for you to be cramming before your test.
对你来说更重要的是保持头脑清醒，而不是考试前死记硬背。
3.knuckle down下苦功to begin to work hard at sth
With just days to go until the final exams, kids on both sides of the educational divide are knuckling down.
期末考试已日益逼近，参与两种教学法的孩子们都开始认真学习起来。
4.buckle down开始努力to start to work hard
Americans of all stripes buckled down, rolled up their sleeves, and worked to bring this country back.
所有的美国人民都挽起袖子，全力以赴，努力让这个国家重回发展正轨。
4.apply yourself努力(工作、学习)to make yourself work hard in order to complete sth successfully
If you apply yourself, you might be able to finish the project on time.
美剧绝命毒师的老白给小粉的试卷评语 Ridiculous! Apply yourself.
