Want to know about ZIO syllabus?

I want to know about the actual syllabus of ZIO on which questions are framed .
anyone who had given it before please give me tips how to prepare for the exam.

solve previous year question papers
link --> https://www.codechef.com/ioi/zio

do, I need anything more to crack this exam.

  1. Common sense.
  2. Practice.
  3. Middle school level math.