I'm a grade 11 taking the following next year;

Data Management
Business Management
English
Religion Philosophy
World History
Classical Civilizations
Educational Leadership
World Geography(Or Computer Science, might switch)

I want to get into a concurrent education program, which is competitive, so I was wonder if if its possible to get a really high mark in any of these courses.

Those courses sound good to me. :) I was in your situation just last year, and probably my best advice is if you're not interested in those subjects, don't waste your time. If you aren't interested, your mark will be low anyways. I think for the most part that if you really buckle down and work hard, these courses will be lovely. :) Work hard and you'll go far! :) Best of luck in the future.

Business Management - no idea
English - i like it. i just started, there's a recurring them of outsider and society's expectations apparently.
Religion Philosophy - no idea
World History - i hear it's a fun class, lot's of material but very interesting.
Classical Civilizations - no idea
Educational Leadership - what is this?
World Geography(Or Computer Science, might switch) - computer science seems to be a good class if you like that field.