its quite a bit of effort and some bad luck and your under 65. E.g. discrete maths final is worth 80%. And barely anyone gets over 70 as the final mark. in that so very little margin. It depends on the subject but trust me, it can be quite hard (1st year engineering at UNSW is )
co op have predefined electives to a extend, while normal stream is more flexible, do a subject less, defer for a semester etc. While co op dont have that and more locked in if you catch my drift.
One of my closest m8s in seng is co op and is going fine, but the guy is a genius aswell and currently working at atlastiann in the summer.
Also side note, co op seng at UNSW aint that hard to get, no offense bro.