This book was about two girls who are taken to the future because the future's iq population is dropping. An organisation takes smart people from the past to the future to boost the iq's. However, they take them moments before they're meant to die. A second organisation thinks it's wrong, as if the person declines, they're returned to die.

Please help me find the name of this book.

This book was about two girls who are taken to the future because the future's IQ population is dropping. An organisation takes smart people from the past to the future to boost the IQ's of the future's inhabitants. However, they take them moments before they're meant to die. A second organisation thinks it's wrong, as if the person declines, they're returned to die.