If you're good at maths, which most people here seem to be as they are doing methods, then you will be okay with geo and trig. it is just that this module probably requires the greatest mathematical ability of them all, but as you have a calculator it should be okay as long as you can interpret questions correctly (things such as bearings, recognising what the question is asking and what formula to use etc.) geo and trig will be okay.
networks is a horrible module for the following reasons:
-it isn't really even maths
-you are basically shooting yourself in the foot by doing networks, as you have a calculator at your disposal, and it is the only module where you can't really use the calculator, as it is mostly just counting distances.
-there is no mathematical way to be 100% sure you have the correct answer, and you are relying entirely on your eyes ability to find shortest distance and critical pathways.
-crashing can get ridiculous, and can create new critical pathways. everytime you reduce an activity time on a pathway you have to check to see if a new critical pathway has been formed.
-there are shitty questions along the lines of 'would it be beneficial for the company to spend x dollars to shorten this project?' we had a massive argument in class over it because some thought it was beneficial, because the company can move on to the next project quicker, whilst others believed that as it costed more it was not beneficial for the project to be crashed. this was an ex vcaa exam question btw...
-dominance, hungarian algorithms and reachability are just annoying, and involve finding all the different ways to get from one node to another.
-basically, it is just trial and error bullshit that is really ambiguous and will frustrate the shit out of you.
anyone who can score full marks on the networks module in the exams, i take my hat off to you.