Dear Gupta,

 No , This is not good to attend a crash course to clear concept. Creash course is only give you to fast review of all three subject and provide some speed study. If you are preparing for JEE2010 that both methods are not good. This is time only for revision in which you are comfortable. so concentrate on that only. do not go all over ;that finish this and this also. Whatever you have studied , revise that.Do not go any new course/new book at this time.Self studies are better option at this time.

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All the best.
 
Regards,
Askiitians Experts
Pramod Kumar
IITR Alumni