Hi aspirant,
Aeronautical or aerospace engineering deals with the study and working with aircrafts both civilian and military. An aeronautical engineer uses scientific and physical principles to test, maintain and repair aircrafts.
In order to pursue this field you will have to do the following,
1) Pass 10th with an aggegate of 65%.
2) Take up science stream and have an combine 10+2 aggregate as 70%.
3) You will have to answer JEE MAINS having physics, chemisty and maths as your core subjects.
4)The core subjects of Aeronautical Engineering are as follows:

Fluid Dynamics

Materials sciences

Structural Analysis

Propulsion

Automatic Control and Guidance

Aircraft Performance and Aircraft Structures

5)Futhermore you can pursue a master in aerospace engineering by answer JEE advanced and getting into a PG programme.

Thank You.