There are a lot of online tutoring sites and which ones you may be interested in are are likely to be the ones concerning mathematics you want to study. https://khanacademy.org is one for elementary topics up to college/university topics.. https://desmos.com has a good online graphing calculator.
Sorry for the late reply Greg ,
I have been searching for a good Pre algebra book for the past 1 month
I tried a lot of books but there is not a single book i can still recommend .