I am currently using zetamac (has customizable number ranges but doesn't allow for decimals), tradermath (seems to be made to resemble the actual test for flow but costs money unfortunately), and rankyourbrain (has decimal questions but the they appear to be too difficult to be representative).
Note that tools to help you prepare for flowtraders and similar tests are not what I'm looking for since they don't have MC questions. Please hit me up or comment if you know of any alternatives.