should i apply to fast?

so im in A2, i have 7A*2A in o levels and 1380 sat, im applying to lums for eco comp sci and lse for data analytics. what i was thinking is if i don't get into lums, or if my lums conditions bbc don't meet, I could go to fast. but idek if i should apply. if it's a good uni etc what are masters prospects and how hard is getting a 3.7+ gpa in cs or software eng