as well as
http://i-want-to-study-engineering.org/ for an idea of the kind of problems you might face at interview.
You will need to be A-level Maths familiar. Order A-Level Maths textbooks, start working through it…
Check this site – http://www.etrust.org.uk/headstart.cfm and check which courses at UK universities would tie in with your calendar. Essential.
For example – http://www.etrust.org.uk/headstart/courses.cfm#CDM )(4-day residential, Cambridge, 1st week July, 2014).
If aiming for Oxbridge, tests in Maths and-or Physics needed. Bac S.