I got 70% in CBSE board in 2016. Can I fill jee mains 2018 and get state govt. colleges after getting a good rank.

Yes, you can apply for JEE Main 2018 if you have passed class 12th or qualifying examination in 2016, 2017 or are appearing in 2018. However, you should also be born on or after October 1993.

About the state government colleges if you could kindly specify which colleges in which state are you looking for, we can give you much more specific answer. You must also know that you need to check the eligibility criteria for any particular state government college and you must meet that criteria. If admissions to that state government colleges are done through entrance exam, then you need to appear in that entrance test, or if admission to state govt. colleges happen through common counselling or if they offer admission based on JEE Main score, you need to check the eligibility and meet that. Do mention about the state you are seeking admission in, we can help uyou better then.

If you want to take admission in government colleges you can apply for DTU and NSIT it consider JEE Main marks to provide admission and counselling is held through JAC Delhi. To be eligible you must have 60% aggregate marks or more in Physics, Chemistry and Mathematics in your 12th class. There is relaxation of marks for reserved category.

Through JEE Main you can also take admission in private colleges of various states.

To check the list of private colleges you can refer below link

https://engineering.careers360.com/colleges/ranking/top-private-engineering-colleges-in-India-accepting-jee-main-score

You should also appear in your state level entrance exam to take admission in government colleges.

Good Luck!!