What guided reading level is Tuttle twins?

What guided reading level is Tuttle twins?
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@TuttleTwins
As a parent, one of the best things you can do for your child is to foster a love for reading. Not only does it boost their academic performance, but it also exposes them to new ideas, perspectives, and cultures. But with so many books out there, it can be challenging to choose the right ones that are both engaging and informative. That's where the Tuttle Twins series comes in, and I highly recommend buying them through preparethechildren website.