At 79 pages long, this PDF covers all the necessary concepts for the GMAT and the GRE, starting from the basics to the advanced; special scenarios have also been discussed. Certain parts are only for the GRE and some are only for the GMAT and those have been highlighted.
Note that this book only covers some solved examples. This is primarily meant to be used as a review guide to cover all the necessary quant concepts for the two exams.