Some takeaways:
The Q & A patterns are usually "How old are you? I'm _____ years old." Age is conceptualized by numbers of candles on birthday cakes. Also common food items or previously learned vocabulary appear in multiples for students to count: "I see six apples," "eight ants", etc. Plural 'S' appears, but it is not necessarily a grammar point because plural verb conjugations are avoided. Plural 'S' can be taught incidentally by having students notice its appearance. The grammar points in the textbook are using capital letters to begin a sentence, a person's name, or 1st person pronoun "I".
They both introduce "Are you OK?" as a daily English phrase. Wonder World uses the context of hungry/thirsty to teach supplemental food vocabulary. Both books also introduce kids to the concept of emotional regulation. Wonder World's grammar lesson teaches punctuation, while Here We Go only teaches usage of the apostrophe for contractions.
This material is suitable for 5th graders (Follow Me 5/ Wonder World 5). In our old curriculum, some 4th graders advanced to textbook level 5. This material is temporarily located here until a new Wonder World 5 page is set up.