M.Tech

There are two main categories of entrance exams for M.Tech courses in India:

GATE (Graduate Aptitude Test in Engineering): This is the most elite and national level entrance exam for the M.Tech course admission. A good score on GATE helps students get admission into some of the best IITs, NITs and other institutes for engineering.
State Level/University Level Entrance Exams: Most of the universities and institutes follow their own entrance tests for the admission in M.Tech course. Some examples include:

UPSEE stands for Uttar Pradesh State Entrance Exam.
PGECET (Post Graduate Engineering Common Entrance Test) of Telangana State
Karnataka PGCET Entrance examination for getting admission into First Year of Master of Computer Applications and MBA/MCA in Karnataka.
OJEE means Odisha Joint Entrance Examination, this is the entrance exam which is conducted for providing admissions to various professional courses in the state of Odisha.
Specific tests organised by respective universities/institutions of India such as IITs, NITs, etc. (IIT Delhi PG Entrance Exam, IIIT Delhi PG Entrance Exam)

Yes, it is possible to have two M.Tech. /M. S. degrees in Engineering in India from two different universities. Currently, I have not found specific rules related to a student obtaining more than one master’s degree in a particular subject or in different specialties. However, there are some factors to consider:

• The structure of a second Master’s programme in a specific field may also vary from University to University and the admission requirements for candidates with previous Master’s degrees.
• It is also important to note that some universities may require a work experience or research experience between the two Master’s degrees.

Whether doing an MTech in CSE is worthwhile is a relative question depending on the options the candidates have. On a positive side, M.Tech provides subject specialisation and that will give exposure to better employment opportunities and remunerative pay packages mostly when they go for higher or research level positions.
Also, the achievement of that degree makes it possible to plan for a PhD afterward. But there are demerits such as time and money consumption, certain employer's bias towards work experience, and the understanding that not all IT jobs entail MTech. The other aspects that are also looked at include the current experience, stature of program, and market demand. Finally, the decision is made based on these factors, in reference to your career goals, vision or plan.