Dear Professor Snape,
How did you get so good at potions? You have real skill, how does one go from Neville Longbottom level to yours?
Dear Bronze Snake,
I have an innate understanding of potions and of their relationships to various elements. Additionally I applied myself to my studies.
One simply can not start as a Neville and become a Snape. That is not possible. Maybe you should aim for a Lovegood or a weak Hermione?