It is very difficult to get engineering by cet exam is about 70,000. Mainly normal engineering colleges not offers aerospace engineering or aeronautical engineering. Because that was very compicative. But no value for that engineering in normal colleges. To get a perfect college admission you can clear jee or on cet atleast below 2000 rank is necessary. But 70000 rank is not sufficient. Atleast try for university level exams. But confirmly the 70000 rank in cet is not eligible for aerospace engineering or aeronautical engineering.

Please specify the exam you are talking about. Mention in the comments section so I can answer your query better.
Thank you.