I went to a school in the slums of Mathare and during our years, we used to have pre-mocks, mocks and KCPE and in our zone, we used to compete for the second last position (to be exact 28 and 29) against Korogocho Primary School.
Since i always used to be in the top 3 positions in class (which translates to position 60 to 90 in other schools like Ndururuno, St. Teresa's girls etc.) i never accepted to be out of the top three positions in secondary and until i graduated with a BSc. Civil Engineering (JAB admitted).
Therefore, TAKE THE TOP FIVE NYAKEMINCHAN'S to a District Seco School, and i guarantee you that atleast 1 will graduate with a university degree later (i.e. not those parallel things or river road papers).
It all narrows down to the environment you are in, everyone is the same.
Receive with simplicity everything that happens to you.” ― Rashi