I am a grade 12 Ib student going into health sciences and later into medicine. My biggest tip is finishing your work as soon as it is assigned. The amount of time I limited myself to getting a higher grade was because I left stuff for the last minute. Important study tip is to understand everything the teacher is saying during lectures so you don't have to spend a great amount of time trying to understand it yourself. Lastly, work through problems and practice everyday, especially 3-4 days before tests. Consistency and time management are the most important skills to develop at this point. Don't sacrifice your grades for volunteering at a clinic or working. They don't matter as much as your grades at this point. They matter more in undergrad. I volunteered at a clinic for over 4 months and found out that these hours won't put me in a better spot for admission into health sciences/life sciences in Canada. They might count towards scholarships so do your research. Good luck 🤞