>>12821156>Speed Mathematics Simplified (Dover Books) by Edward Stoddard Cover complement math that will reappear in cs.
>How to Solve It: A New Aspect of Mathematical Method by PolyaWhen you see a problem and don't know how to attack it, this will give you tips for how to start wrestling it.
>Algebra: An Elementary Text-Book - For the Higher classes of Secondary Schools and Colleges Volumes 1 & 2 by ChrystalRigorous build up of Algebra+bonus material you barely see anywhere
>College Algebra (AMS Chelsea Publishing) by Henry Burchard FineAlso a rigorous build up of Algebra but doesn't get sidetracked with as many nonstandard topics
>Book of Proof by Hammack>How to Prove It: A Structured Approach by Velleman>How to Read and Do Proofs: An Introduction to Mathematical Thought Processes by SolowHow to do basic proofs and follow mathematical arguments