I did (am doing) Level 1 within 1 year, however I spread the start times, one in October and one in February. This meant that I didn't have two EMAs or Exams at the same time period, and only had two assignments due within a week of teacher other. However, the February start ones were easier as they were the first two, so relieved the stress slightly.
If it is an absolute necessity to achieve the degree within 3 years, or you aren't too bothered about the grade and just need/want a degree, then yes, do the degree within 3 years. However, after doing Level 1 within one year, even spread out I am getting fatigued and know for sure that I am not going to do Levels 2 or 3 full-time.
On the other hand, if you wanted to cut a year off the degree (5 years instead of 6) then you could most definitely do Level 1 in one year, as it doesn't;t count towards your grade. That's what I did, and it has worked, but it is challenging.
I know for sure that I would have to really sacrifice my social life if I did Levels 2 & 3 full-time. Whereas full-time working, part-time studying allows for some sort of social life.
I hope this helps.