Actually, I was seeking for top universities, which has mathematics depart, in Pakistan and I found one, namely Quaid-i-Azam University. Which is known for its Education in "Natural Science". Then I apprehend what is Natural Science. So, I started to read the article on Wikipedia about it but I didn't find mathematics in their context. Is not mathematics a branch of "Natural Science"?
In university departments, mathematics is usually grouped with the physical or natural sciences. The physical or natural sciences usually include physics, chemistry, mathematics, statistics, computer science, etc.