I am using 15 min Strategy in Nifty 50 for the past 6 months, it is working very well
First 15 Min. no Trade
After 15 min you have to draw Fib chart from the 15 Min,. candle, depends upon from low to high or high low. and take position @ 0.786 and exit @ 1.618 if the market move one side you can trail and exit @ 2.618