More advice here: http://jamoemills.com/oxbridge
Admissions tests! Practice makes perfect with these, as timing is a major factor. Be sure you can get through the questions as effectively as possible, and give similar questions a go to ready yourself. Below are resources to help with humanities and science subjects.
Admissions Tests’ website: http://www.admissionstestingservice.org/
Oxbridge discussions: http://www.thestudentroom.co.uk/forumdisplay.php?f=23
Maths/Science subject preparation: http://www.ukmt.org.uk/individual-competitions/intermediate-challenge/
(Go to the Senior levels if these are too straight forward. Great for problem solving practice).
Any questions or video suggestions, please do post them in the comments.
By Jamie Miles