Confused between words and terms

Can someone tell me what age of students should be in high school? 

What is the difference between First year high school, second year and third year in high school?

How to use the terms sophomore, or freshmen, junior, senior in college year?

Is there any terms to describe students or pupil in high school, college and university?

How about the age for the grader? 
How many grade are they?
What age can be consider as High School Senior?
The sequence: sophomore came first, then junior, then senior, right?
What is the difference between junior high school and senior high school?

 

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XiaoLinLingXIII #1
Ok Thanks.
How about the age for the grader?
How many grade are they?
What age can be consider as High School Senior?
The sequence: sophomore came first, then junior, then senior, right?
What is the difference between junior high school and senior high school?
informantxgirl
#2
Technically speaking, all those terms can be used for either high school or university students - high school freshman, university freshman, etc. The difference is in the variety of English you're using - UK, US, Canadian, etc. The typical age of high schoolers is 13-18.
lemon_tips
#3
This terms differ between UK and US English dear