根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
How and What to Study Before Exam
Study for an approaching exam．Studying hard for a few days can be tiring, but it always pays off ! Most people clearly recall the fear they felt when they realized that an exam was drawing near．If you’re in this situation, don’t worry．Many people have proven that there is still enough time to study, if you do it properly．Here are some strategies to help you．
  1   Fear will only make your situation worse．If you are focusing on the horror, not on the knowledge of an exam ,you are more frightened．It is certain that you can’t do well in the exam．If you are nervous, take deep breaths, keep calm and find yourself strategies to help you．
  2    Exams usually cover a few main ideas, concepts, or skills．When you are short of time, focus your energies on the key areas．Review the highlighted topics in textbooks and the parts your teacher stressed repeatedly．   3  
Determine what subjects you don’t know enough and are not clear about．  4   The parts you know more about still need reviewing, but they will come to you more easily． So try to focus on the more challenging topics． 
Studying together can be helpful．You don’t get extra points for doing it alone．Classmates can be helpful in studying, and choose someone who will be able to help you．Ask for help from your parents, brothers or sisters．  5    From a study group, not only do you have additional help , you also have the advantage of studying with people you know well．

A．Do more study on these topics．

B．They may really appreciate being asked．

C．This way, you will for sure work harder．

D．They are all clues to what are really the vital topics．

E．Realize that last-minute studying is not the best way to study． 
F．Calm down!
G．Study the most important highlighted topics first．