The MOCA has a maximum score of 30, anything below a score of 26 calls for further evaluation if there are concerns for cognitive ability. It's a single page assessment you can find on the 6th page here: https://championsforhealth.org/wp-content/uploads/2018/12/MOCA-8.1.8.2-English.pdf

It tests several different areas of cognitive functioning, and the total score is only one indicator. A poor score in any one section can indicate a more specific issue with memory, recall, abstraction, etc