Bellarmine is located in the Rose Garden where youth who live in that area attend Lincoln High, The Bells have never drew from their area, it's a private school that draws from all over the 408.
Presentation the same located in the affluent Willow Glen area where those students go to Willow Glen, Lincoln, Del Mar or Leigh.
Notre Dame is in the hood of south down town san jose. All those students go to Lincoln San Jose High or Downtown College Prep.
I will agree with you that Gentrification is taking over many parts of the 408 and beyond. Just not those schools as they cater to those with a little scrilla in their pockets