Your Formula Booklet is officially your new best friend for the duration of the IB Physics course. Unlike the GCSE, you get pretty much every equation given to you. Unfortunately, they are not annotated.
However, one kind soul, Boaz V. (DrR: please advise if you have an original source), has painstakingly gone through and annotated the entirety of the formula booklet with the meaning of the various symbols.
There are a few equations that have not been given for the IB (or are sneakily hidden within other equations) - GradePod has summarised these here, make sure you are familiar with them.
Use this version to help you with practice, until you familiarise yourself with what everything means. Once you are happy, print yourself off a copy of the official IB data booklet for your revision.