Also I have noticed that the 'personality tests' are almost standard when applying for any job nowadays. I was thinking it is because the employers are focusing more on the concept of team and teamwork rather than just simply an individual talent.

The great news is that - if you'd like - you can do an IQ test on yourself. There are four distinctly measurable areas. You can then train each of these areas if necessary. A great and easy-read of the topic is 'Emotional Intelligence 2.0' by Travis Bradberry. This book also includes a basic self-evaluation.