That's one of the coolest things, when you have some ostensibly silly teenage love songs coupled with Lolita style sexuality, but also fucking godhead songs. The classic example is Phil Spector with The Ronettes and The Crystals, but George Morton was operating on a similar level here. See also: France Gall & Serge Gainsbourg, Britney Spears & whoever produced Toxic.
The Beatles stole a lot of ideas from this era of girl group pop, and you can hear it in the way that the verses of a lot of those songs have a beginning, middle and end then adjust to lead smoothly into the chorus, rather than just repeating the same vocal idea four times. We've got layers and layers here in these songs, but, as is expected of great writing, it's never distracting. You don't have to hear all of the syncopated percussion if you don't want to, but if you do you might just stuff your bra and keep a diary. God I hope I don't get my period in gym class.
Note: I deleted the final tracks of this collection, which was a make-up advertisement and other things, so the ish would fit on mediafire. If you are offended, I am not sorry. Find something better to care about.