Even though I'm writing this after finding out I somewhat bombed the exam (Got a H1 grade in both tests and the essay), I found taking this subject to be a really positive experience and have no regrets ,although I've already got the WAM needed for entry into the masters I want to do so long as I pass everything, so I'm probably currently a lot less stressed about marks than others... - Really well organised and interesting subject. Also, keep in mind that despite this being a "policy" subject, most the content was maths based, with not as much discussion on real world events as you might expect. That being said, you still get a great opportunity to apply the theory to the real world in the essay.
The first part (a bit over half) of the subject was pretty much all about the 3 major models covered, Ricardian, Specific Factors and Heckscher-Ohlin, with a few other concepts like terms of trades introduced. The second half of the subject involved smaller concepts/models covered at a quicker pace, such as Offshoring, the Increasing Returns to Scale model, Economic Geography, Import Tariffs, Politics and Trade and the Environment. Your knowledge of the prerequisite subject Inter Micro/ECON20002 is also very important so be sure to revise the major concepts like utility, comparative advantage, MRS, MRTS, PPF ect. if it's been a while.
Ultimately, if you enjoyed Inter Micro, was comfortable with the maths in it, and also have some interest in trade (even if it's just for a specific issue), I would highly recommend this subject.