Best mutual funds to invest for 15 years, and gain as much as possible

I am a defence personnel. I have been investing in the following mutual funds for the past two years:

Mirae Asset Emerging Bluechip Fund: Rs 2,000
Reliance Small Cap Fund: Rs 2,000
SBI Bluechip Fund: Rs 2,000
L&T Emerging Businesses Fund: Rs 2,000
Kotak Standard Multicap Fund: Rs 2,000
DSP Equity Opportunities Fund: Rs 1,000
Aditya Birla Sun Life Pure Value Fund: Rs 1,000

I am investing a total of Rs 12,000 per month

I have 15 years of service left. I want to invest for 15 more years and gain as much as possible. I am willing to take risk and can increase my investment up to Rs 20,000 per month

I am not sure about how much money should I invest and which schemes to choose? Or should I exit or change any scheme?

I don't need insurance as Rs 5,000 per month is already going to Naval Group Insurance Fund which gives an insurance cover of Rs 75 lakh. And I have been investing Rs 25,000 per month in provident fund from the last six years.
--Praveen Kumar

Puneet Oberoi, founder, Excellent Investment Advisorz, responds:

You have invested in too many mutual funds. Probably, you wanted to spread your investments across different mutual funds. But you have overlooked the fact that some of these funds might hold similar stocks and it might result in overlapping of investments.

I would recommend these schemes to you: Axis Midcap Fund, Kotak Standard Multicap Fund, Franklin India Smaller Companies Fund.

These three funds have just 11 per cent common investments and their portfolios are diversified into different sectors and stocks.

You must identify your goals, find out how much money you need to achieve them. Once you do this calculation, you can start investing accordingly.