AOA Roshan wadhwani
Brother, the essay topic you opted is a closed topic because here you have only two options, first is to accept that really education is the best weapon and second option is to write against the statement by denying the fact that education is the not the best weapon.
There are two main keywords in essay statement "Education" and "Weapon", your whole essay must revolve around these two keywords, but you focused on education, importance of education and functions of education.
Dear, write the importance and functions in such a way that to prove education as the best weapon, because in this essay you have only to prove it with arguments and examples that education is the best weapon.
Secondly, you wrote about education system in Pakistan and causes of low standard of education in Pakistan, these points are totally irrelevant and in no way proves education as the best weapon.
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