Several South Indian States has 30% seats in Engineering Colleges reserved for Woman. Significantly contributed to increase in women in Tech.
Here is a link to explaining Quotas in Colleges for AP and Telangana. http://www.netbadi.in/reservation-quotas.html?showall=1
Women's Quota for both states in 33.3% (1/3rd has to be women).
Personally I think it worked well. The Quota was first implemented in 1993.