Engineer

Hello Biju,
If you want to work on the airside of the airport then you need a licence from DGCA. However, if it's non-airside job then one does not need DGCA licence. There are plenty of jobs for both mechanical & aeronautical engineer in airside as well as on non-airside areas.

Hello Gireesh,
An aeronautical engineer can get a job in armed forces, can appear for civil services exam, in organisations where R&D on aviation is taking place or even in a factory which is producing components or assemblies of airborne objects. You can even go abroad for MS or can think of doing MBA also.

There is a long list of engineering entrance exams in India. Check the below link:
https://www.shiksha.com/b-tech/exams-pc-10
You will find the tentative exam date and application form date.

Hello Rachana,
Some entrance exams have negative marks while some don't. For example, JEE, BITSAT and AEEE have negative marking while SRMJEEE and VITEEE don't.
So, if you mention any particular exam then I may tell you its marking scheme.

Hello prathamesh,
Yes, you can. For that, you need to subscribe the exam details from Shiksha website so that you can receive SMS reminders regarding the exam dates.
You may refer:
https://www.shiksha.com/engineering/resources/exam-calendar