HI Bart - you can get all the past papers and mark schemes for all your exams for free at the relevant Exam Body website
For your Business Studies, here is a link that will take you to the right place
http://www.aqa.org.uk/subjects/business-subjects/as-and-a-level/business...
Good luck!

Have a look at these videos on S-cool's YouTube channel. They offer tips for how to organise yourself and get yourself in the right mental state to optimise your revision. https://www.youtube.com/user/ScoolRevison
Also, in the next S-cool newsletter we will be putting registered users in touch with a Memory Coach - follow the link in the email (planned for 22nd Feb) to see if it is something that will help you.
Hope that helps

The greater the energy, the larger the frequency and the shorter (smaller) the wavelength of light. Electrons can only be ejected from atoms when the energy the atom receives from the incoming electron is above the THRESHOLD FREQUENCY for that particular metal. So if you draw a graph or current against frequency, you will get NO CURRENT when the frequency is below the THRESHOLD FREQUENCY, then you will get current when the frequency rises above that.
More INTENSITY means more photons of the same energy per second. So increasing the INTENSITY for frequency BELOW the THRESHOLD FRQCY will make not difference (no electrons will come out), but increasing INTENSITY for frequency ABOVE the THRESHOLD FRQCY will increase the number of electrons released, and will therefore increase the current.
Ta daaaa!