India

You have got 49% in class 12th.
Yes, you can easily get into a private engineering college or other stream colleges by either clearing a particular state exams where class 12th percentage criteria is 40% or 50%, or simply by management quota if you have money. Extra information to keep in mind before joining:
The next three years after joining a particular engineering college or commerce college tenure, you might forget your class 12th performance and move on to give your best shots in your semesters scoring 8 pointer and above (which is a great thing), but the moment you step into your fourth year, your 50% marks will come back in your academic life, as you are the biggest and probably the only hurdle in between you and your dream company job. Many a times your CV won't be even shortlisted (mainly the MNCs). So, you need to be prepared for this. But don't worry, If working in a big MNC is your dream then the most suitable option to fulfill it will be - by joining a startup (at whatever they pay in the name of salary, provided you get to learn and will learn about your field, working there) initially and after 12 year experience you can switch over. Else if you have thought of joining PSUs by clearing GATE/CAT then, Best of Luck. Civil services, banking and SSC CGL etc. Will be there too if you wish for a government job after 3/4th years. (Though these exams are not a piece of cake to clear, but if your preparation is good then you might easily get into one). Bottom line:
All you need to have is focus in the right direction and patience till you achieve your goal.

Student Pilot License (SPL) & Private Pilot License (PPL) are intermediate stages of Commercial Pilot License Training.
You will be issued an SPL by the flying club after some hours of ground classes and an internal exam. Thereafter you shall become eligible to start flying training.
It is very simple logic SPL - PPL - CPL.
YOU CAN SKIP PPL AS IN ANY CASE YOU ARE ASPIRING FOR A HIGHER LICENSE, WHICH WILL ALLOW YOU MORE PRIVILEGES THAN PPL.
For becoming a commercial pilot, there is a specific eligibility criteria, which you should first be aware of. This is decided on what subjects have you taken in class 12th. It requires PCM to be a pilot. And, even if you have not opted for the same, then you can appear separately for these subjects and become eligible. Further, you should be aware that you are medically fit to be a pilot, so I would suggest you to visithttp://www.dgca.nic.in/medical/medical-ind.htmandgototheclass 2nd examiners tab to find out doctors who will examine you for initial fitness. You can visit any doctorate from the list as per your convenience. Once you are done with Class 2nd medical, find out a suitable flying club for you as per your convenience. You can fly in India or abroad. I would suggest you fly in India. Besides finding the club, be aware that you will have to appear for:
1. Air Navigation
2. Aviation Meteorology
3. Air Regulations
4. Aviation Technical
5. Aircraft Specific
6. Radio Telephony
Here, 1-5 are conducted by DGCA and 6 is conducted by WPC. Prepare for these subjects and appear, as exams are conducted every quarterly. For preparation, flying club will help you or there are private instructors available in metro cities as well. You will fly for 200Hrs + Clear DGCA and WPC exams + Clear Class 1st medical, then you shall get your CPL. The next license is ATPL, which you shall be able to apply for once. You will then have to probably fund or self-sponsor your type rating on whatever fleet you are selected in an airline. Then, you finally get a job as a pilot. I hope the process is well explained to you. CPL is an expensive affair. It might cost you around Rs.18-20 Lacs for flying + DGCA exams Rs.500/- each exam + Medicals for Rs.10, 000 + endorsements and license issue fees around Rs.25k + Type Rating around Rs.15 Lacs. So, decide wisely before you enter the field.