This is something GCs from K-8 schools will do. However, they are doing it for all the students and IMO there is a little bit of politics that goes around.
If you are looking at staying as a day student (not really looking for schools) I don’t think a consultant is necessary. Schools have info sessions that walk you through the application processes (good during 7th grade), as do test prep sites like Test Innovators (that is a grate resource). Choose depth over breadth in terms of activities. Anything done in earnest will come through and I believe that is what the schools look for in the end. Work hard (like a regular kid, not skipping grades and stuff), be curious.