I'm not a tax expert thou

I believe if you want to be a certified tax agent however, you'll need a professional qualification and a place that would accept a lawyer that's specializing in taxation.

Most people who don't have audit experience will probably face palm when dealing with taxes.

And there are many branches of taxation.

Indirect tax, direct tax, tax planning and etc.

Each field have different prerequisite, most of them having at least some exposure to audit industry. But not all.