In each round there are 3 math problems and each student participates in 3 rounds of their choice and with each problem being worth two points the maximum a student may receive is 18 points.
There are 3 math problems. This is in each round. Each student participates in 3 rounds of their choice. The maximum is 18 points. This is with each problem. This problem is being worth two points. A student may receive the maximum.