AP Exams help

So, AP deadline is coming up and I have 5 APs I have the option of taking. First of all, I don’t know if any of you have taken AP Computer Science A or AP Statistics, but in those classes I know little to nothing but comp sci has retakes and stats we have group tests all the time, as well as other means of getting As. Stats, I actually feel somewhat confident in as I do pay attention at times and I know some stuff as I always study the review, but I do not know the difference of it to the AP exam.

My questions:
If I buy a review book for these 2 classes, could those possibly get me to at least a 4 or will I be unable to as i dont know much going into my second semester?

Is it even worth it to buy any of these exams? Like, I’m never going into english or economics related classes so would it even be worth it?

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My DD scored 5 in AP Computer Science Exam (May, 2018). She self studied mostly, She found following website really helpful.
https://sites.google.com/view/ace-the-ap-exam
Hope this helps.

If you had a good teacher and you have decent Java skills, getting a 5 on the CS A exam shouldn’t be that difficult. Same with Stats, a good teacher should have covered everything pretty thoroughly. Knowing my kid, I doubt if he did any extra studying for either exam.