The requirements for each belt test can be found below:
9th Kyu (Orange belt)
8th Kyu (Red belt)
7th Kyu (Yellow belt)
6th Kyu (Green belt)
5th Kyu (Purple belt)
4th Kyu (Purple belt with white stripe)
3rd Kyu (Brown belt)
2nd Kyu (Brown belt with white stripe)
1st Kyu (Brown belt with two white stripes)