It depends on the … personality. Some kids (and adults) feel encouraged by “You can do it”, but that’s just one style of supportive parenting. For boy, instead of encouraging him to aim for 100%, it might be more effective to declare (like in GS orientation) “low/no expectation” like 50%!

When grandma + mom + dad all say you must achieve 100% otherwise can’t go out tomorrow, the pressure might be too heavy, for our boy. For another kid, this motivation might turn into positive energy and push her to a new level of mastery.

It also depends on …. mileage.

eg: math …

eg: spelling 15 words … sounds easy for me, so I can have 100% confidence, but what about 50 words? I won’t have 100% confidence. For boy, 100% about 15 words might be equally hard, simply because of mileage.

eg: writing 5 “valid” sentences about (a series of) pictures, with optional helper words. At age 17 I had a hard time doing it in English. Every sentence I wrote sounds bad, even though I was well-trained on English grammar. My vocab was like 500 words, but I didn’t really know how to use the 50 most basic words! My mileage with English was simply insufficient. With more mileage I reached this level naturally. 100% confidence was really hard but became achievable 2 years later.