Hey Moonlight, welcome to AN! Second year IT student at LTU? Chances are I've been your tutor before

Which electives did you choose in 1st year? In 2nd year prerequisites come into play and this can be an issue for some subjects.
I chose all IT/CS subjects in 2nd year. The skills I picked up made my final year easier. If you want a really good computer science elective, try Artificial Intelligence (CSE2AIF). Yes AIF is tough but it's also enlightening. I wrote a review for AIF back when I took the subject in 2013:
Re: La Trobe University Subject Reviews and RatingsDon't do CSE2IEP. That subject is rubbish.
If the department is still allowing IT students to enrol in CSE2DES (concurrently with your core CSE2ISD) then definitely choose DES.
You might also want to knock out CSE3PE in your second year (if you haven't already

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Also keep in mind you can take a 3rd/4th/5th year level subject as an elective for 2nd year. The rule is you can go up but you can't go down. You'll just require subject coordinator approval.