Safirullah, some people are hesitant to speak others do not have the courage to face blank paper i.e they are hesitant to write. When it comes to unseen things e.g precis, essay, comprehension etc we tend to ditch them and the result is a fiasco.

Essay is made up of paragraphs that are in turn made up of sentences. Sentences are made up of words, phrases and idioms.

Learn good words, phrases and idioms. Step 1
Work on writing good sentences preferably short sentences. Step 2
Learn the art of writing a coherent and well-knit paragraph(s). Step 3
Start writing essays. Step 4

Give 1 hour for 5 days to each of the above steps. God help thee. Aameen