Marks required for admission in govt colleges excluding IIT,NIT.IIIT...

it depend on college where you want to take admission and eligibility criteria and cut off will vary for each state government college.

Government funded technical universities like BIT, Mesra,  Assam University, Silchar, HBTU, Kanour will take admission through JEE Main rank and you should try to score more than 150 marks in JEE Main to get admission in these college.

State level government colleges take admission through state level counselling. Few states conduct their own entrances  and few states take admission through JEE Main rank.

Generally 50-60% percentage marks are required in 12th to make eligible for admission in mostly state level government colleges.

Good Luck.