If you are studying the biosciences then becoming a student affiliate of the Royal Society of Biology offers significant benefits and shows potential employers that you are serious about your future in the life sciences.
Strengthening your CV
Money off books
Free copy of The Biologist
You may also consider setting up your own BioSoc - which is an excellent way to encourage other students and members of your department to socialise by arranging a range of fun and stimulating lectures and events.