I’m a doctor. I’m also a medical school lecturer.
I’d say the hardest part of medical school is actually getting a place. It really is a highly distilled sample of super academic, high achieving people who get a place. Not just that, but most medical schools aren’t just looking for any old grade A student. They’re also looking for rounded, empathic people who a clear motivation to be doctors. Competition for places is tremendous, and a lot of excellent candidates don’t get a place.
In my view, getting through medical school is easier. You need to have a certain type of brain that can hold a lot of information at once, and visualise complex systems. You also need to be able to hold complex concepts, taking into account everything from the molecular to the sociological. BUT you’ve got 5 years at uni to get to grips with it all. I’d say the pace of work is very manageable.
The real challenge comes after you graduate. Being a doctor (particularly a junior doctor) is a gruelling experience. The worst years of my life were my first 2 years as a doctor.
I hope this hasn’t put you off.
It sounds like you’ve a long way to go before applying. I hope it goes well and that you get the grades. If you haven’t already, think through exactly why you want this. Helping people doesn’t mean you HAVE to be a doctor. There are plenty of other roles in healthcare. Granted, doctors get paid better. But compared to other professions like business or law, most doctors earn above average pay but do not become particularly wealthy. So finance shouldn’t be a big motivator either. Basically, you need to know your “why”. Because becoming a doctor really is “taking the oath of most resistance”.
Good luck!