A parent in Australia is talking about the unusual figures about his son's school results, because the reading figures of the Year 3 students are better than the Year 5 ones. So, he wonders about that. And the teacher says to him that Last year the school accepted a large number of students from families where no one has ever learned to read. And, the parent understands it and agrees and say:
That would definitely affect those year levels.
The expression "....those year levels" seem to refer to the "Year 3 students" and "Year 5 students."
Instead of saying "...those year levels", can I omit the word "LEVELS" and simply say That would definitely affect those years."?
In other words, if I didn't use "LEVELS", would "....those years" still be referring to the "the students" OR would it be referrign to "the year in usual sense" - a period of 365 days.?