CSS English:Why CSS Aspirants Fail in English?

Why CSS Aspirants Fail in English?
NOTE::Last year over 92 % aspirants failed in English Precis & Composition Paper and 81% students failed in Essay paper!
Reasons:::
1.poor expression
2.weak grammar
3.improper usage of vocabulary
4.use of wrong words
5.not answering essay well
6.lack of study
7.weak structure of essay
8.lack of continuity
9.weak in precis
10.idioms,synonyms,pair of words not well prepared
11.taking english lightly
12.no practice of writing
13.preparing essays but not answering according to title of essay
14.poor guidance in english
15.blunders