Good Evening

Hope you are doing good, as per you query in AMU question for b.tech is pretty similar to jee mains question. Chemistry part is only based on ncert. Read all parts of chemistry of 11th and 12th carefully and solve numericals. Physics is based on jee mains but difficulty level of maths is high. Focus on physics and chemistry more because you can score well by physics and chemistry because IIT level maths is asked in amu btech. If your maths is good then no problem.

Hope you found it helpful
All the Best!!!