Taxation

Not exactly necessary, but as you can think of, it would be difficult for you to get equipped with the basic knowledge of your own course. So, I will suggest you to learn German for your own enhancement. And, so that you can easily be placed in any of the firms of Germany easily.

Investment banking and direct taxation both are altogether different fields and it totally depends upon one's self-interest as you can develop skills, no doubt, but at the end what keeps you dedicated toward something is the interest of yours.
Talking about scope in both the fields, both the fields a