The first verse starts with the lines
Won't you take me back to schoolI need to learn the golden ruleWon't you lay it on the lineI need to hear it just one more time
The first two lines establish a pattern (seven syllables then eight syllables), but the next two lines don't completely follow it (seven syllables but then nine syllables). In a way, this extra syllable in the fourth line represents the addition that the lyrics themselves mention ("one more time").
The beginning of the third verse exhibits a similar expansion:
Make a promise, take a vow,And trust your feelings; it's easy nowUnderstand the voice withinAnd feel a change* already beginning
Once again, the first two lines establish a pattern (seven syllables then nine syllables), and the subsequent lines initially follow this (seven syllables in the third line) but then break away (ten syllables in the fourth). Here, the alteration in the number of syllables matches the "change" in the lyrics. Additionally, the rhyme scheme shifts: instead of line-ending rhymes (like the preceding "vow" and "now"), the final syllable of "within" rhymes with an internal sound in "beginning."
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*I think it's "a change" in the recording, but the booklet has "the changes."