Imprecise definitions of terms add to confusion on this issue. What you want very early on is a hook, and sometimes this gets confused with the inciting incident. The hook would be much more likely on p. 1 than 10 or 12, and in those first pages you also want a sense of tension, a sense of place, and to meet the MC and establish their "normal," their controlling belief, their stakes, and make the reader care about them before everything turns upside down (which is the inciting incident).
The incident incident is what kicks off the MC's outward conflict, the main action plot, and since most MG novels are 35k-55k these days, p. 10-12 sounds awfully early to me. In the manuscripts I currently have with my agent, the inciting incidents fall around p. 35-40, or roughly 1/4 of the way in.
Regarding p. 10, one thing that's sometimes advised is that you try for a cliffhanger at the end of it. This mainly applies if you're querying agents, because 10 pp. is such a common amount of sample text to ask for with a query.