It is absolutely YES if you are hunting job,especially as a fresh hunter.It is natural to take the certification as one of the criteria.But if you want to enjoy the journey of translating, it is unnecessary to take these exams,because all the examinations are done for test.You like it and are confident of yourself,and most important,you live on yourself well,then, it is useless to take the exam.
If you bear none or little of the advantages, then,I am sorry, you had better to take the exam and win the certification,because you are a body translator and you should follow the game rules.