Is Questbridge even worth it?

I was planning to apply to questbridge. However, I learned that most finalists have an EFC of about 0. My family’s EFC is roughly 25k-35k. Though my EFC is pretty high, I come from a household of 7 (4 kids, 2 parents, and one grandparent). Should I apply to questbridge or would it be a waste of my time? I understand that the deadline is 2 weeks away.

Most QB finalists have a family income of $65,000 or less, and family of 4. Not all have an EFC of 0$, but an EFC of $25K-$35K would indicate an income that is too high, since when calculating the EFC, the number of people in the household, and their relationship to the student, is taken into consideration.

Was the EFC calculator a federal one, and was it a good one, i.e., one that asked more details regrading the number of people in the household, etc, and did you use the information from your parents’ tax returns from 2018?