Second year courses

Hello everyone,

I am a rising second year physics student and I have a few questions.

When does second year course selection open?

It seems that I have some choices between courses to fulfill my physics pathway. I have 6 physics courses I am required to take but I have a choice between my math courses.

I have a choice between 280 or 221. Which one is recommended and/or better to take?

I have a choice between 225 and 231. Which one is recommended and/or better to take?