Really depends on how much time you can give, the most frequently paired subjects are
1. FR+AA
2. PM+FM or LW if you want to keep the load lighter.

TX as a standalone cause of how big the course is, truth is, you decide whats best for you and according your time available.
You should also keep in mind, what are your strenghts and which subjects you are good at, so you can pair those along with subjects you find difficult to manage load. But this is a very personal choice, and it is best to evaluate with a counsellor who can make a personal plan for you depending on your situation.