@Kesav Sundar few tips for better chance:
1) apply from multiple accounts, that itself increases your probability multifolds.
2) And if possible from a female PAN card. This might sound weird, but that is what's working for me. I usually apply from 2 PAN cards, me and my wife. If I get 1 successful alottment, my wife gets 5!!
3) Apply on 1st day itself.
P.S.: I know point 2 & 3 has no logic, BUT it's just my STRONG observation / conviction after multiple successfull alottments, both in SME & Mainboard IPO's.
Good Luck!