Ref. No. 1173 Alif
In the name of Allah the most Gracious the most Merciful
The answer to your question is as follows:
It is a kind of offering bribe which is unlawful; you must shun it. You have to work hard in your studies and contact the experts to know the easiest way to pass the examination. You are not allowed to deceive for your personal gain. You should not pay money to get a certificate. It is cheating and a kind of deception. Our Prophet Muhammad (peace be upon him) said: 'He who deceives us is not one of us'.
And Allah knows best
Darul Uloom Waqf Deoband