Hi I had the same questions you had as I had never done beast academy before and there is no free trial. A month costs $15 whereas the whole year is $96, so that’s a lot of difference, and you are not restricted to one year, you can access grades 3-5 and you determine how to provide access to the lessons to your child. My DD is starting third and in the past two days since I signed up has been enjoying using it. I only wish they had a mobile app to use.
You can cancel within the first 14 days if u don’t like it, so after a lot of thought I decided to sign up for the whole year as it made more sense. Also when I signed up, I asked them (in comments) about the bundle offer with books in case I decided to buy them within the next few days and they were nice enough to send a coupon code to use within a month if I decide to get the book set.