Have you tried using a term planner? Thats what I used towards the start of year 12 and I personally felt like it helped me out when it came to laziness and not being motivated. It helped a lot as I had written down when my upcoming assessments were and what I wanted to do within a day or week...
idk but law and engineering are two completely different degrees that dont really go well together imo, plus the work load seems like its gonna be hell, granted take my opinion with a grain of salt