Eligibility criteria for various professional degrees & institutions

• Eligibility criteria for IIT & NIT
• Main Entrance : > 50% in all subjects
• Advanced : Top 20 percentile in Main or > 75%
• From 2017, it appears that the 12th marks will be further de-emphasized (http://indiatoday.intoday.in/education/story/iit-nit-admissions/1/456575.html) 
• From 2016, NIT admissions will be based primarily on the IIT JEE main score (Source)
• BITS
• BITSAT rank
• 12th pass and > 75% in PCM
• PES
• PESAT (Entrance exam). > 60% in PCM

Resources

• http://www.iprofindia.com/iit-jee/about/ 
• http://www.thehindu.com/features/education/nit-admissions-likely-on-jeemain-scores-alone-from-2016/article7648299.ece
• http://indiatoday.intoday.in/education/story/iit-nit-admissions/1/456575.html