Zero Points
Zero Marks
noun
Zero points means you got zero points. Could also refer to getting zero marks on your test.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
最大公約数を公分母にするということが全く理解できず、試験で零点を取ってしまった。
I couldn’t understand how to make the greatest common divisor a common denominator so I got zero points on the exam.