As depicted in below image, you can trade accordingly
1. If Banknifty (15 minute candle) crosses 37950 level then you can buy 38000 CE for 100 points or more, trail the stoploss with the up move.
2. If Banknifty (15 minute candle) crosses 37450 level then you can buy 37500 PE for 200 points or more, trail the stoploss with the down move. My suggestion is to avoid trading for PUT or downside movement, it may be a trap because Banknifty trend is Bullish.
3. Avoid trading in the range between 37950-37450, because it is a trap zone, but you can do scalping trade for 5% +, only.
Banknifty is again in parallel channel: