The Pearson Test of English (PTE Academic) assesses the Speaking & Writing, Reading and Listening skills, skills of the candidates to ensure that they are capable of studying in the international environment, with a good grasp of the universal language of English. 

A work visa is a permit that gives you the right to work and live in a country other than your country of residence. You have to meet several qualifying conditions to qualify for a work visa, which change based on which country you want to work in.