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Hello Sohrab,
You should not get too fascinated with ethical hacker as they show in movies. Hackers mean "thieves". No company would hire a thief to steal other company's data as that could land them in serious legal trouble. Most of the institutes provide just a basic fancy course under the name of ethical hacking, just to attract students and earn more.
I would rather recommend you to go for security specialist professionals. These jobs are highly payable and in high demand as most companies need them to protect their own data. These jobs work on the same logic that the best thief can protect the data in the best way.
For the same, you can go to some reputed computer training institutes like NIIT, etc. You can go for Java courses followed by networking courses and CCNA/CCNB (CISCO) courses. After this, you can also opt for CEH (Certified Ethical Hacker) certification courses, if you wish to. The cost of these courses vary from institute to institute. You can contact a reputed institute in your city for course and fees details.
Ensure you do these courses alongside a degree course (BCA, B.Tech, B.Sc, etc.) for better outcome.
I hope I have been able to answer your queries to your satisfaction. If so, kindly upvote this answer. If you've any further questions, kindly revert.

Hello,
The choice of the engineering branch depends on your interest.
Below mentioned are the reasons:
1. Market conditions vary every 6 months to 1 year. Engineering is a 4 year course. There is a high chance that the field which looks the most promising at the time of taking admission might not be good when you complete engineering.
2. Engineering mostly involves practical skills rather than theoretical knowledge. If you choose a stream based on market trends, chances are that you might not be able to understand the subject properly. This may result in lesser grades and impact on practical skills.
I hope it helps. If so, kindly upvote this answer. If you have any further questions, kindly revert.

There is a plenty of career options available after completing B.Sc in geology. You can choose either private or government sector.
Career in Private Sector:
1. Medical research
2. Lumber and Paper Companies
3. Private Schools
4. Private Banks
5. Life Insurance
6. Cosmetic Companies
7. Botanical Gardens
8. Horticulture
9. Medical Laboratories
10. Broadcast Companies
11. Private Hospitals
12. Private Colleges
Career in government Sector
1. Medical laboratories
2. Testing Laboratories
3. SEED and Nursery organizations
4. Biotechnology Firms
5. Banks
6. Life Insurances
7. Government Colleges
8. Agricultural Research Organizations
9. Botanical Survey
10. Hospitals
11. Medical research
12. Food Institutes
13. Wildlife and Fishery Departments
14. Public Schools.