Answer:
I am good at English, and I'm also good at math.
Step-by-step explanation:
To compare something means that note the similarities or differences between things. In this case, we are comparing how good we are at both English and math. This person is good at both. This is there similarity.
It is tempting to think that "I am good at English, although math is my favorite subject," is the correct answer. However, I think because they are not comparing the same thing, that this is not the best answer. They do not say whether English is their favorite subject or not.