marking system

I would like to put the attention towards marking system which is followed in India.the student is judged on the basis of the marks which he/she gets.i think marks is not the good basis to judge once intelligence he may have not performed well in any particular test but might do well in the same test the next time it is taken so this proofs that the ability of a student should not be checked on the basis of his marks.the practical approach should be taken to teach the student which ever course he/she choses.so that afterwards he/she could not face any problem in choosing their profession or in their professional life.i would like my readers to put their comments on this post.