Now i am in 12th and i would like to do B.tech in mechanical. So what can i do to get good college. And does any cretayraya to get addmition

First, u should study hard and grab physics, chem and maths well. For preparation of jee, u hv to practice mcq from standard books available in market. A good performance in JEE exams will land u in a good college with your preferred subject. All the best. Thank you.

For get admission in good engineering college you have to qualify JEE exam , if you get good scre then you can get good college or other option is for get direct admission in private college or university