How easy for a new president who is been elected to fight corruption in a nation where all the systems of government is been corrupted, like in the force, and judiciary, even the politicians.
Having the mind to stop corruption is not easy in a nation that corruption is seen as nothing, making an attempt to do so some politicians will do everything to frustrate the agenda. Do you think a genuine president can easily end corruption of this level ?
If the president is truly genuine like you said he can start the era where they will push to ending corruption but due to tenure system, I doubt if he will be able to actually put an end to it because by the time he will be done fixing his tenure would have already be done so he will not be able to totally achieve it as he should have but if they run the royal system of government where the power last through a Life Time then he will have enough time to fix and sustain the new system he has created.
It's literally possible but it will take a whole lot of time to get it done totally as it should be.