When you get the report back, you will understand why it is called a battery of tests. There are many different tests researched and validated to indicate specific functions.

The WAIS-II Wechsler Adult Intelligence Scale-II measures processing speed and the difference intelligences, verbal, math, reasoning, etc.
The Wechsler Adult Memory Scales tests for auditory, visual and working memory.
The Trail Making Test,
The Paced Auditory Serial Addition Test (PASAT) was developed by Dorothy Gronwall, a New Zealand neuro psych who cared for a past NT participant. It was a gold standard test. Dr Gronwall did a lot of ground breaking research. Sad that a great brain researcher died from an aneurysm in 2001.
The MMPI-II

There are many other tests within the battery that are published and sold to testers.

For many years, the Halstead Reitan Battery was the standard battery used for brain injuries. Now, newer tests and batteries use computers to make the testing and scoring easier.