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First thoroughly go through ncert at least for chemistry and physics.
After this go on through HCV(physics) and Irodov(physics).
For chemistry the study material in ncert is more than sufficient for jee mains but for advanced you can check out specialist publishers in organics and inorganic and physical.I recommend u Morrison or OP Tondon for organic.JD Lee for inorganic and RC Mukherjee for physical.
For mathematics NCERT is not sufficient. You have to upgrade your skills particularly being engineering aspirant.
So you should purchase a series of mathematics books from the same publisher eg CENGAGE or ARIHANT
You have just to be focused on whatever you are aiming for. And finally I will recommend you to buy a regular test series package from any of a reputed institute eg Resonance or FIITJEE to test your learning skills at regular interval.
Good Luck

Aptitude is what you should have, i.e. liking for the design, finding and trying to understand its importance. Ability to differentiation between things around you on the basis of quality and experience.
And most important, would you do something to recreate the same or better experience by your own.
These can be reflected by following examples.
Let's say you tend to like wearing different types of clothing, you chose your clothing very carefully, and you also give good suggestions when asked about clothing.
Most of us have this ability. But when you felt an urge to create a good clothing by either re utilizing or buying a fabric. Picking up a specific style, understanding your taste. Then you tend to develop certain aptitude towards designing.
Sooner or later you tend to start drawing things or make picture collages. All the above activities tend to reflect the aptitude.

Hi,
Bachelor of Business Administration (BBA) is offered by the Department of Management Studies, Christ University. The programme has been ranked by various ranking agencies as the best BBA programme in the country. The course ‘focuses on the person equipping each individual with conceptual, analytical, communication skills and healthy attitudes to ensure for excellent performance and committed service.’
To know the environment of the college I would suggest you to talk to the present student.
You can refer this link for top BBA colleges:
https://www.shiksha.com/top-10-bba-colleges-in-india-article-7797-1
You can refer these links for college details:
https://www.shiksha.com/bba/course/bachelor-business-administration-symbiosis-centre-for-management-studies/232009
https://www.shiksha.com/bba/course/bachelor-business-administration-bba-christ-university/183912
All the best.