Is section 2 of the BMAT really just GCSE standard?

Firstly, its important to get familiar with the assumed knowledge guide which is freely available on the BMAT website. It contains all the potential content that may be asked about in the exam - essentially a summary of Biology, Chemistry and Physics GCSE with some maths on top. 

Although the knowledge is GCSE standard, its level of application is higher than that and you'll be expected to apply it in some unfamiliar situations (A level standard application and beyond). It is also important to note that the physics often throws people off  and sometimes goes in to AS level standard. Thus, it is wise to cover the physics topics that come up in some extra detail. For example, principles of complicated electrical circuits, SUVAT and the common equations and laws that come up. Because this section is so time pressured, it is wise to memorise these equations but more importantly understand how to apply them.