Assalamoalaikum wr wb! Well, i compiled some notes from mark schemes ....might be helpful for revision... remember me in your prayers.. May Allah give us all success in this world as well as the HereAfter.. Sorry..forgot to mention it in the file name...."My notes" is for biology P.S. Keep checking this thread for the resources for upcoming exam => A Level May/June 2012 Last Minute Revision..here.. EDIT: SORRY, There was a slight mistake made...<c^2> is the mean square speed NOT the root mean square speed.. and also there was a mistake in ms for the continuous spectrum...made the correction..it's the deceleration NOT the acceleration..! The file is updated with the correction made...apologies once again..!