My advice to you is to practice fast math: learn the division table up to 1/11, learn how to multiply double-digit numbers, how to work with zeros. You can actually use math tools (Mimir math for iOS), Math tool on Viktor Cheng website to practice.
To practice your quantitative skills I would recommend different math, logic, and verbal tests on https://trytalentq.com/how-to-prepare/# and then select "Elements Practice Test".
You don´t need to learn them by heart, rather skipping through to get a first impression and a better understanding.
Hope it helps,