@STripathi Ji , im assuming that you are not going to apply in sh quota in tataT.
4 shni each would be best use of funds as of now.
I will suggest that you try to arrange some demat, 4 or 5. The reason being, shni is getting heavily subscribed these days, mostly its a block unblock game. Retail has better chances ( yes i know that shni gives 14 lots, but still its the worst category to bid in for heavily subscribed ipos)
Ireda- retail 4x max
TataT- retail 6 to 7x max.
I hope you are getting my point. Cheers