Engineer

How to become JE (Junior Engineer)?
After 10th or SSC, you should do 3-years Diploma in engineering. It can be from any Polytechnic college, recognised by state technical board or UGC recognised University.
After completion of course, apply for jobs with Government Departments like Municipality, PWD, Railways, Electricity or other departments. You can also apply to engineering industries or companies in engineering.
JEs are required in every specialisation like computers, chemical, automobile, electronics, etc. In government departments, most of such job opportunities exist in civil, electrical and mechanical engineering.
Technicians, who have done 2-years ITI course, can do Diploma in engineering and apply for promotion to JE.

In my opinion, no, it never meant that. Just remember, class 12th is a part of life, it is not life. You can be anything you want, you just have to have a mindset with focus. Class 12th, especially in India is considered as a sign of the future growth, but it's not completely that. However, if you score well in 12th, it is good, if not, then also it's okay.
If you want to be an engineer, you can join a normal engineering college and after engineering you can write prestigious exams like GATE, ESE, etc. which will take you to new heights. You can also write exams like UPSC (if you want to be a bureaucrat) and can contribute something to society. Remember, there is an end to class 12th, but the life is endless. Never stop hoping and dreaming. So stop screwing yourself and embrace what has to come without fear and be happy and focused.