Will a portfolio of only equity mutual fund under multicap, ELSS, midcap, and small cap for a period of 10 years give good return of 15 to 20 %.

You are expecting returns on the higher side for a 10 year horizon, but it is quite possible. Going for a good selection of funds across market caps is a good strategy.

Make sure that as you near your 10 year horizon you time your exit from equity funds such that you don’t become the victim of a market correction crash at that time.

More: Explore Various Portfolios of Mutual Funds