I use to work for IRRC (the part of the government that you get a work visa from).

The general IELTS is the one in the Canadian Language Benchmarks (there's another version for French). Not every temporary residence visa needs English or French proficiency, generally you just need to be able to demonstrate you have enough English or French ability to do your job for a TFWP. There is no score requirement but obviously higher is better. If the officer in charge of your application is not satisfied that you can do your job in one of the official languages, then you will be denied entry.

You may also need to show a proof of health by taking an International Medical Exam. It depends on what country you are residing in or have resided in. For example, maybe you've been in the US on a work permit for the last 18 months but have an Indian passport - in that case you don't need to submit health stuff. If someone with an American passport lived in India for the last 18 months, they would need to submit a health report. This website will show you if you need one: https://www.canada.ca/en/immigration-refugees-citizenship/services/application/medical-police/medical-exams/requirements-temporary-residents/country-requirements.html if your plan is to become a permanent resident (PR) you'll need an exam eventually.

Depending on the country you're from, they also need to show proof of funds. It's a little racist... basically if the country in question has a better GDP per capita than Mexico, then you will need to show you have proof of funds. Otherwise we were directed to not bother checking. Yes, seriously. Yes, the split is literally above Mexico. Yes, I know it's dumb and it could be a problem for you. I don't work there anymore for a reason.