I'm not going to get into whether text changes work or not. They all seem to still convey the same meaning, but I'll leave the grammatical evaluation to Nobody on Dynasty. Grammar isn't my strong suit. Big thing I noticed was the use of "mum" instead of "mom". Feel free to keep it if you want, it just stuck out to me since I'm not used to seeing it.
P10, Panel 1: The phrase is going into someone else's school, they aren't switching schools, just visiting in this case. Switching implies transferring and that's not whats going on here.
P13, Panel 4: missing handwritten "Who Knows?" text
P23, panel 3: Capital "R"
P25, panel 5: Question mark looks weird here
P27, panel 5: "any" is missing between there's and such
Overall the cleaning and typesetting looks good. I'm not an expert on font choices but they all seem fine to me.