I used
Aptitude Test, Psychometric Test, Online Aptitude Tests, Online Psychometric Tests - AssessmentDay.co.uk to practice the verbal reasoning stuff. They also have the maths stuff as well.
There are several verbal test papers, and it only costs about £8 to sign up for the other on-line tests. Their format is identical to the ones in the BA tests. It really helped me get to grips with them.