I am about to be a senior, and I am seriously considering to start college in january(spring semester). The college I want to go to you are supposed to have 4 years of english, but since I want to start college at semester will 3.5 years of english be good enough?
if I HAVE to have for years should I just enroll in another english class so then if I take both for a semester it will equal 1 full year.

No, you need to have 4 years of english.