What should I do?

Hi

I am retired bank employee and I work as an insurance agent.  I have to come across different clients who often ask many questions on income tax.  I am able  to give some information.  But I need to learn more.  As the subject is a complex subject I am unable to understand or rather interpret  many things in the income tax act.  Now,I wish to take up some exams to overcome my defeciency.  I will be obliged if anybody can help me, a 59 year old, which will be the best way.  

Nagaraja K