Need help with school career project...

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I am in Grade 11, Alberta(grades in percents), Canada. I'm doing a project on potential careers we have interest in. I have thought of some that interest me, and took some(multiple) quizes to also gain some idea. The results include careers like Biochemistry, Biomedical engineering and Psychiatry. I need some help to decide what the best choice would be for me.

I need to know requirements to get into such programs. And for example, how you should be doing in high school. That is some info that I'm finding difficult to find. Along with the recommended path of education. Interest assessments for me usually suggest the sciences or medical.

Also, what would be the costs of medical school compared with normal university education?

Is the level of difficulty to high or something? I'm not really going to go for private practice or going to teach at a university.

Any pointers I should know, tips or problems?

Thanks for the help.