When we give a gate exam in 12th or after?? And what their profit in future???

You can appear for GATE exam when you are in final year of your graduation or after completing your graduation in engineering or Master's in science.

Graduate Aptitude Test in Engineering (GATE) is conducted by Indian Institute of Science (IISc), Bangalore and seven Indian Institutes of Technology (IITs) namely IIT Bombay, IIT Delhi, IIT Guwahati, IIT Kanpur, IIT Kharagpur, IIT Madras and IIT Roorkee. The entrance exam is held for PG admissions to Engineering/ Technology/ Architecture and Science. GATE is a national level PG engineering entrance examination, offers admissions to M.E./M.Tech/Ph.D at the IITs, NITs, GFTIs and other universities in India, Several Public Sector Undertakings (PSUs) and research organizations also recruit on the basis of GATE scores.

Below is the eligibility criteria of the exam you can check

1- Candidates who are applying must have completed their Bachelor's degree in Engineering/ Technology or Master’s degree (M.Sc.) in any relevant science subject or must be in the final year of the programme.

2- Candidates who have completed their Bachelor's degree in Architecture or must be in their final year of the programme.

To check the complete details you can refer below link

GATE Eligibility Criteria

GATE exam is important because of below mentioned factors:

-M.Tech – Campus placements in National and International private or public companies

-Several reputed PSUs and research organizations recruits on basis of GATE Score. i.e. IOCL, NTPC, BHEL, PGCIL, BARC etc.

-Teaching: Professor, Asst. Professor at IITs, NITs, reputed educational institutes etc.

-Junior Research Fellow: ISRO, DRDO, BARC, CSIR, IITs etc.

-Senior Research Fellow: ISRO, DRDO, BARC, CSIR, IITs etc.

-Junior Research Associates/ Senior Project Associates Scientists “C” grade jobs -Career in Research & Development Technical value addition Expertise in subject/domain specialization

Good Luck!!