I dreamed up the two sentences. I don't know that in 'X not to mention Y', whether X is a bigger benefit or Y is. Let's assume that increasing job prospects is a bigger benefit than building social networks. In this case, should I use Sentence 1 or Sentence 2?
- Higher education offers an environment to build important social networks, not to mention increases job prospects.
- Higher education increases job prospects, not to mention offers an environment to build important social networks.