Gaining a pupillage when you qualify is immensely difficult and you will need some work experience before you do this. This is known as a mini pupillage and is 3 days to 1 week shadowing barristers in chambers, in the summer of your penultimate year, or a year earlier in some cases. You should look to do 3 or 4. Some mini pupillages are assessed – where your performance is formally judged and then taken into consideration when you apply for a pupillage there. The following firms offer mini pupillages. Many are open to students in their first year of university also.
Be aware that many law firms employ critical thinking tests as part of their recruitment process. A popular one is the Watson Glaser. Practice these tests HERE