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Aeronautical Engineering is a course mainly deals with Design and Manufacturing of Aircraft /Aerospace Components. Since, you already have an experience as Supervisor in Mechanical (Hope in Production). You can get a good job into production of Aviation components.
In India, we have many manufacturing companies related to aerospace production at Bangalore and Hyderabad location. Most of the companies related to aerospace components in manufacturing are wont advertise or Named with aerospace Pvt. limited and so on. My advise is to please show your patience in searching through search engine websites with some keywords which also includes AS9100 Rev C Certified Companies because when a company needs to produce a components in Aerospace, it has to get a certification of AS9100 Rev C.
Since, you had completed Diploma (Fire and Safety), you can select your profession in fire and safety. It will also be a good option. Once you got experienced in this domain, a huge opportunity knocks to get into petroleum industries at UAE, Saudi Arabia, etc.

Dear student,
Firstly my best wishes with you for preparation for CAT exam. Believe in yourself, you can do it and build will power, learn to manage tome, study specific then self-access each topic wise, identify gaps, fill gaps, move on. Complete your syllabus and Mock tests. These are some key points to success. CATS mainly tests your concepts with speed and accuracy. It has limited curriculum, so do not leave anything. It is computer based, you may be required to practice on computers. You can divide your study in two steps: step 1 and step 2. In this Step 1, set your fundamental. Do mastery on each topic chapter wise. Divide your curriculum into short objectives. Start QA, DI & DS, VA simultaneously. In step 2. You should study with good books. Make a time management time table as 90 minutes for Maths, 30 minutes for Reasoning and Logic, 45 minutes for Data sufficiency and Data interpretation, 30 minutes for English Proficiency and usage, 45 minutes for reading comprehension. And after this, must do self-assessment. Move from simple topics to complex and excel step by step. BOOKS: Maths: NCERT books class 8th to 10th, Qualitative Aptitude for CAT by NIshit Sinha, Pearson publication, Quantitative Aptitude for CAT by Arun Sharma. Tata MC Grew HILL, Higher Algebra Hall and Knight, Aptitude and data Interpretation by Vivek Gupta and Sandeep Amar, DATA INTERPRETATION: by Edger Thorpe, / Robert M Johnson, ENGLISH: High school grammar by WREN and Martin, Word Power Made Easy by Norman Lewis, Business English and Communication by Clark Grade C. Verbal Ability by Arun Sharma and Meenakshi etc.
Thanks