Hi Shubh,
I have to tell this. You are brave to invest into Investment and Banking looking at 3-5 year horizon. These 2 areas are the ones which are under stress and I am not if anyone can predict what will happen in next few years.
If you wish to invest in a sectoral fund, I will recommend for a pharma fund.
however, if you are interested in these sectors, do choose some specific stocks rather than going for a fund.
Happy Investing !!