Dear Aspirant every specialization has hard work and if do MBA in finance it's not hard for you because in finance all you need to study is maths of the higher level that have been studied through your engineering. MBA from finance is good for you. All you need to do you have understand the basics of finance in your MBA 

Hello,

I admire your focus and your readiness for achieving your goal in life. With this attitude you will definitely achieve even bigger goals in your life.

Management has major domains like Finance, Operations, Strategy, Marketing, Information Technology, Human Resource and other minor domains.

Finance is one of the major and most-liked domain by the MBA aspirants, some because of it's learnings and some cause of money they get for knowing it. Don't worry about you being able to make it through it or not, if you are READY to LEARN, you'll be fine.

As far as your question is concerned, you don't need any knowledge of Finance before entering into an MBA Finance program (talking from my own experience). It is designed in away which makes it flexible for everyone studying in it's system. Even after this you want something to do about it, you can start reading about Financial Accounting which is the foundation of Finance.

If you wanna explore even more into this domain, read and prepare for CFA (Chartered Financial Analyst) exam which has 3 levels to clear with increasing difficulty.

Have a look here to know more, https://www.cfainstitute.org

Hope this helps.

All the best!