I think the percentiles are more meaningful than the raw scores.

The percentiles are against 8th graders who took them. The raw scores may depend on how easy or hard the questions are to the students. There are at least some minor variance in score each year.

But bear in mind that the percentile differential is huge around raw score of 14-18 range. (45 to 85 in percentiles for 4th grade ENG as per 2013-14). So, 1 or 2 silly mistake can change quite a lot.