IUPAC name of m-cresol is:

1.  3-Methylphenol         

2.  3-Chlorophenol

3.  3-Methoxyphenol   

4.  Benzene-1,3-diol

Hint: Both -OH and -CH3 group attach to benzene ring

The structure of m-cresol is as follows:

m-Cresol - Wikipedia

Here -OH group gets higher priority than -CH3 group. Hence, the numbering is started from OH group. The structure with numbering is as follows:



Hence, the IUPAC name of the compound is 3-methylphenol.