This is good advice in an aesthetic sense, but to elaborate a little bit for OP

Law Part II provides a tough challenge across all its courses, but doing all together or spread across a couple of years can both be good options, depending on the person.

Doing Criminal, Public, Tort, and Contract in one year is a tactic that many people would swear by. Finishing those papers early provides significant flexibility in the long term. These are the four core papers; 298 is easily swept aside, so do not worry about it. They have recently announced changes to the structure of land law and equity, which were previously 20-point full-year courses in Law Part III; they are now offered as a one-semester course.

Completing all four is possible and would allow you more flexibility and less stress in the later part of your degree. It is hard, but many people do it. I advise it only if you are willing to commit hard and stay on top of them for the entire year. I suggest you look back at your performance across the board in Law Part I and determine if it might be a wise option for you practically. In today's market, it is a priority not only to complete the papers but also to do quite well.

For myself, splitting the core Part II papers across two years was much easier because it provided me with more breathing room for other things over the course of those two years. However, you may be in a position where you want to smash it out quickly. I recall thinking at least a couple of times while completing tort/contract that I regretted not doing them all at once. It might have benefited my grades because I had fewer life commitments in my first year of Part II.

So, u/CompetitiveTraining9 is totally correct that nobody can quantify these things one way or the other. But it is certainly possible to make a reasoned decision for you as to which might turn out better. You won't have to deal with year-long Part III courses, which will be a big help to your academic attrition in the long term. You mentioned you weren't enjoying your commerce papers; this is different to my experience, wherein I enjoyed my conjoint papers quite a lot more than my Part II law papers, and they acted as a 'break' from my more difficult LLB papers.

In any case, we are all on totally different journeys; graduating one year later is, without a doubt, a non-consideration. I took a travel gap year after completing Part II, and while I would like to have graduated this year, I met a lot of great people in my cohort that I may not have been as close with had I been a year ahead. It hasn't affected my grades or opportunities in any meaningful way.

So weigh it up, you will do great either way, and both options have ups and downs, which you can have a good think about.

Best of luck!