You are asking about Espoo International or Kulosaari secondary but I'm guessing that you really mean the lukio (Upper Secondary), NOT the comprehensive schools.
If you are born 1992 or earlier then you will be entering Kulosaari lukio (10th, 11th or 12th grade) in August. If you were born in 1993 or later then you will be going into secondary school (ie grades 7-9). Lukio is what the Brits call Sixth Form college (not sure what it is called in Canada ? High School?)
The programme in both Etelä Tapiola lukio and Kulosaari lukio is the Cambridge AICE programme. This leads to AS and A level qualifications as in the English system. So the idea is that you choose your A level subjects and the programme is built around those. As far as I know Etelä Tapiola only offers the AICE diploma and the AS levels - it does not offer A levels. Kulosaari offers the possibility to take the full A level examinations.
Kulosaari lukio
http://www.ksyk.fi/ksyk_www/index.php?l ... en&item=57 (the curriculum pages have been temporarily removed not sure why)
Etelä Tapiola
http://www.etela-tapiola.fi/espoo_inter ... lisivu.htm
Another possibility would be the Eira Aikuislukio. It also offers the AICE programme and an accelerated Finnish Foreign language programme.
I have no idea about study credits for Canada. But if you are worried about equivalent credits then you would be better off following an international curriculum like the IB diploma. Google for Ressu lukio, SYK and Helsinki Inernational School (The latter is a private fee-paying school). It is harder to get on to an IB course but they are more widely recognised internationally.
Entrance to these schools is based on an exam and on the latest school report. In Finland Kulosaari and Etelä Tapiola are looking for 8+ in the school reports. But the main requirement is fluency in English. The IB schools are looking for 9+ (and SYK is one of the hardest to get in to) and again, fluent English.
The tuition is free and there is a new law stipulating that health insurance is a requirement. I am not sure how this applies to minors though. You would have to pay your own transport costs. So if you are living in Helsinki city then the Kulosaari bus pass would be significantly cheaper than the regional bus pass into Tapiola (even though you may be living closer to Tapiola than to Kulosaari!!!).
I suggest you contact the schools directly for more detailed answers to your questions (by phone or by email). For example, I am not sure that those schools offer Finnish Foreign language tuition as part of the curriculum. The schools will give you much more info than the Min Edu. IMO the schools will want to know WHY you want to come here to study so prepare some good answers in advance....
BTW I have a son (born 1992) who is applying for lukio right now, so I can give you more info if and when you need it. He is applying to both IB and AICE lukio. The schools have Open House meetings lined up in January and February so we will be going to all of them over the coming few weeks.