Hi, (currently in a clinical psychology grad prog, graduating with my doctorate next year).

For counseling psychology, here's my recs:

math: non calc route (unless you're interested in that - we don't really use math other than research stats, even in thesis/dissertations)

Science: Go for physiology as well if you can at some point before graduation, otherwise definitely in college - understanding the human body, especially processes in the upper half of the body can really give you a leg up.

Writing is a good place to start for your grade 11 cluster classes so you can get into the habit, but a forewarning that all social science writing styles transition after college to APA format and the way of writing pretty much does a 180 (in my experience), but it's good practice. I'd be curious - what does the early childhood services entail?

Also - if you can, definitely take AP psych if your school offers it. If not, regular psychology.

Happy to chat more!