For SNAP, you should prepare through TESTFUNDA. In case of XAT, try L3 problems of Arun Sharma and TIME. I am also tagging few current students of B-schools to get more apt picture. @pratik-shinde @khushi-agarwal

For SNAP beginner level, you can start with TCYonline. It is economical and you can design your own mocks depending on chapters you want to focus on. Then as your comfort level increases, try Test funda or ims for better grasp.