Even if you gained 80 free marks, that does not mean you will achieve at least 80. Courses will be scaled accordingly. You aren't the only person who is able to achieve those "free marks" and course conveners know that. Notably, MATH2019 will scale down unless you achieve some raw mark in the 90s. Most of the marks in that course are fairly easy to achieve, so it's mainly the final exam differentiates students. You might find the exams to be easy - good work, but others may not find it as easy as you. It does not mean they are necessarily free marks. For MATH1131, those tests and online quizzes aren't to "test" you, but rather to see if you are up to date with the basic concepts. They were never designed to rigorously test your ability. Likewise with the labs. They are designed merely to complement the theory, and not to make you sweat. Do the actual past papers and see how you go. MATH has a course pack, and you can find PHYS past papers online.
In second year, the assessments will overall be much harder and designed to rigorously test you since it may be the only test for a certain module - the finals may only be on the last module you do. Some courses may have a few free marks here and there, but ultimately, when there's a 40-60% final that is much harder, those free marks don't mean much. Still important to get them, but they generally do not reflect the difficulty of the finals.
On a personal note, I enjoyed second year much more than first year. You actually do 'engineering subjects' (well in mechanical at least) like thermo, fluids, solid mechanics, design for manufacture, not like PHYS or COMP or ENGG1000 (which was a complete waste of time).
