Hi Akshay,Jacket is a must, a good riding Jacket starts from 6K. I don't know why this seller is giving away gears like free. Riding jacket would eliminate the elbow guards as jacket will have in built elbow and shoulder protection. Knee guards are however needed.
Looks like a sham to me to be honest. And these probiker gloves aren't going to be very useful (by the looks of it). You need some good protection along with nice winter gloves. Riding gear is anyways best purchased offline after trying it on.