It depends on when your birthday is, if you just turned 17 last fall or sometime this year, you would likely be a junior in high school (11th grade) but if your 18th birthday is coming up sometime this school year or this summer, then you would be a senior (12th grade).
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This depends on your country. There are many countries that use the "year" system.
In the UK, you start Year 11 at the age of 15. So 16 year olds would be in the second half of Year 11 and the first half of Year 12, in the UK.
I am 17, and I am a Senior in High School (12th grade), but some kids are 17 and a Junior.