Growing up low income in a fairly affluent area, it was normal for me to see my peers have private teachers and take prep classes.
Tutoring is perfectly fine in my opinion - there will always be an advantage to having resources without a doubt.
However, I believe it depends on individual choice, similar to what @Mwfan1921 mentioned (if I am understanding correctly).
I’m sure quality of life for my family would be MUCH better if we decided to live near the rural cornfields of Urban or somewhere similar. Larger house, cheaper gas, food, etc.
Education will probably fall short compared to where my family chose to live - a single bed and bed apartment for a family of 3, expensive gas, expensive food (for the most part), and etc.
Education where we live, however, is TOP NOTCH, I would say - by the way my family makes around $17k roughly before tax.
That being said, I think all income levels have some degree of choice, and I think that is, for me, “equality of opportunity”. I’m not saying it’s not “easier” for my more affluent peers to have certain results, but I had access to the samr opportunities as them.