If you want to join a Diploma in Aerospace Engineering you must have passed or be appearing in 10th class from any recognized board with a minimum of 45 % marks.
This baseline makes the course accessible. It does not demand 12th or a science stream. So even after 10th you can start preparing for a career in aerospace.
Because the diploma lasts three years and is recognized by All India Council for Technical Education (AICTE), you will receive proper technical and practical training.
To secure admission you typically need to qualify in the entrance exam AME CET.
Beyond academics you should be passionate about aviation or spacecraft design interested in working with aircraft or space related technologies. You should have good problem solving skills willingness to learn new skills and a sense of responsibility.
Advantages
You don't need to wait for 12th after 10th you can start.
Qualification is modest (only 45 %), so many students may be eligible.
The diploma opens a path into aerospace / aviation industry early good for motivated students.
Course gives practical knowledge of aircraft and spacecraft design, maintenance and testing.
Things to consider
You need to pass AME CET entrance test not automatic admission.
Apart from marks you must have passion and willingness to learn technical and practical skills.
If you have just completed 10th and you are fascinated by airplanes or spacecraft you are a good fit. If you like hands-on work design assembly maintenance or testing of flying machines you should consider this diploma. Also if you want to start early in aerospace without first doing 12th this diploma gives a direct route.