If you have been asked to attend an interview then the recruiter is wanting to find out more about you, your skills, and experience and work ethos. It is not a test as such but is often quite daunting as you know that what you say in an interview is often the difference between getting a job and not getting it.
An interviewer will often ask what your strengths or skills and weaknesses are and many candidates find this difficult to answer. If you are someone that finds it hard to blow your own trumpet you may end up doing yourself a disservice and not really informing the interviewer of your true skills. If you on the other hand get too over confident then this is often also seen as a downfall and may cost you the position. You need to be honest but try and sell your skills and make the employer think that you are the right candidate for the job. If you are asked about weaknesses there is no point in saying you haven’t got any or picking something like, you work too hard, as they will know what you are trying to do. Instead you are better to mention something small that you may struggle with by follow up by talking about how you are going to improve on it.