Dear Praveen,

Crash course means that student can complete their doubts and revise the whole syllabus in 1-2 weeks or in one month.It is very useful for the students who wants to prepare at the last time of their exam.

While crash courses are useful in helping candidates revise the portions for exam in the last few months before the exam is held, the best preparation is when candidates are fully clear with the subject material and given concepts which is much more likely through self-study .

I hope you got the answer!!

ALL THE BEST!!

If you have any query then feel free to ask!!

Hey Praveen , Crash course means a rapid and intense course of training or research (usually undertaken in an emergency) or we can say a quick, intense course of learning, especially one which is informal or hurried . There are many crash couses in online websites for shortcut knowledge of any subject you want.

I hope this helps to you and thank you !!!