For the very basic precalc foundations this one was great: https://www.amazon.com/gp/product/0760706603/ https://www.amazon.com/gp/product/0760706603/. For eas

For the very basic precalc foundations this one was great: https://www.amazon.com/gp/product/0760706603/ https://www.amazon.com/gp/product/0760706603/. For easing into higher maths I recommend this one on proofs: https://www.amazon.com/How-Read-Proofs-Introduction-Mathematical/dp/0471406473 https://www.amazon.com/How-Read-Proofs-Introduction-Mathemat.... Also if you're concerned about quality the MAA reviews math books and publishes a basic library list for undergrad maths: https://www.maa.org/press/maa-reviews https://www.maa.org/press/maa-reviews.