dipen said:
they only pointed the time gap betwen elementary school and high school and never pointed the time gap between high school and college.
I think I now know where the problem is coming from for you. If you look at the form carefully, they have asked for you to list the secondary and post secondary education. No need to write elementary. Start with your highest degree at the very top row, then go down to highschool (ISc or 10+2 or whatever you did that made you qualified to join a college). Stop in highschool level (start date and end date) and no need to worry about the gap between elementary and highschool.
It is not that common to have a big gap between elementary and highschool, but it is common between highschool and college and gradschool. When they saw you had a gap between those levels, they became concerned of something and want to know what you were doing. And you are the one who gave them that concern by providing not necessary info (elementary education). But remember this, on the top of the page, in one of the boxes, you need to write the number of years you were in each level of education and it asks for elementary school. That's the only place you need to mention something about elementary education. Good luck and see you in Canada.