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Hi Harsha,
Since you've already completed you engineering, I would recommend you to not go for a general aviation course when you can pursue MBA in aviation.
MBA in aviation will have 2 benefits for your career.
1. It will be a 2 in1 benefit, completing MBA and Aviation course at the same time.
2. Your engineering degree won't get wasted.
You can pursue the same from UPES.
UPES is a great university to pursue this programme plus their MBA Aviation always has high placement percentage, so there is nothing to worry about.
Next point is eligibility: Here's the eligibility data that I copied from the website, I am sure you will qualify these.
Minimum 50% marks at Higher & Senior Secondary level (10th & 12th)
Graduation in Commerce / Economics / Mathematics / Statistics / CA / ICWA / B.Tech / B.Sc (PCM) with minimum 50% marks from a recognized University.
The last thing that you have to consider is what will be the career options after you're graduated from the university. Here's again a list of career prospects which UPES promises it's students can achieve after they complete their degree from UPES, Take a look.
Airline Operations Management
Airline/Airport Revenue Forecasting
Fuelling Management
Flight Analysis
Ticketing and Passenger Services
Loyalty Program Management
Corporate Planning & Strategy
Business Development

Professional opportunities in machine learning engineering and natural language processing (NLP) Science are among the most intriguing and promising in the job market today. Machine learning enhances the intelligence and productivity of many systems and industries. Students will learn about machine learning algorithms from a mathematical standpoint and how to implement them in various programming languages. These days, machine learning is all there is to accomplish in the field of computer Science. Companies in a wide range of sectors are increasingly using this cutting-edge technology. Therefore, it is natural that you would be curious to find out more. Since you are already an established professional, you need not stress about the prospect of spending a lot of money or taking time away from work to attend college. Many other types of online courses may be found at places like Coursera, Udemy, and NIIT, just to name a few.

Hello Abha,
Ask your daughter to evaluate herself by solving one or two mock papers. By this, she will get to understand her weak areas.
There are a number of books available in the market for the preparation of the same.
For QA :
Arun Sharma: How to prepare for Quantitative Ability for CAT
How to Prepare for the CAT Common Admissions Test by Muhamed Muneer
Quantitative Aptitude for Competitive Examinations by Abhijit Guha
Quantitative Aptitude for CAT and Other MBA Entrance Exams by Trishna Knowledge Systems Pearson
Books for Verbal and Reading Comprehension:
How to Prepare for the Verbal Ability and Reading Comprehension for CAT by Arun Sharma and Meenakshi Upadhyay
Nishit Sinha's Verbal Ability and Logical Reasoning
Norman Lewis Word Power Made Easy
Books for Data Interpretation & Logical Reasoning :
How to Prepare for Data Interpretation & Logical Reasoning for CAT by Arun Sharma
Trishna's Verbal Ability And Logical Reasoning For CAT And Other MBA Examinations by TIME
Along with all these, ask your daughter to read English newspaper daily, accompany her with English novels, etc., this will build her vocab.
Practice is key to success.
Also, make sure she focusses on time management.
Good luck.