Lots of high school students complete the well rounded base curriculum including math to the highest level available to them and all three sciences often plus one or more at the advanced or AP level, so meeting the expected high school preparation for an engineering major is pretty common (even for those not going into engineering).
But if there are “hidden requirements”, like major-relevant ECs started in 9th grade, is it any surprise that we have 8th and 9th grade students posting on these forums asking what they need to do for college admissions, and parents who helicopter-manage their kids’ educational paths and hire college admission consultants from an early age to help them compete for college admissions?