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Heelo Pranaya,
One can enroll and appear for the exam as many times as they want.
This is one more fact which gives a sense of relief to all of us that there is no restriction on the number of GATE attempts on the basis of caste. An aspirant belonging to any category, be it SC, ST, OBC or General can enroll and appear as many times as they desire. There are even many lecturers/professors who appear in GATE exam to keep their knowledge/skills updated.
few points need to be taken into account by GATE aspirants:
1)Aspirants, applying for concerned exam may apply at any age as there is no age bar for appearing in the GATE
2)Till GATE 2014 percentage score validity was 2 years and from GATE 2017 onwards it is 3 yrs.
3)Candidates are eligible only after completion of their Bachelor Degree. Diploma holders are not eligible for the examination. B.Sc. BCA and BCS (a three years degree) students are also not eligible for GATE Exam.
4)In order to get admissions in post-graduation, candidates need to get marks above the GATE cut off.

Hello dear, Due to COVID, exam of RRB was delayed but now its date has been released and exam will most tentatively held by Railway Recruitment Board CBT for 103769 Level-1 Posts in Feb 2022
RRB recruitment is a highly competitive annual process. The Railway entrance examinations are held for the selection of technical and nontechnical cadres in the Indian Railways. Thousands of RRB Vacancies for different RRB Exams are announced every year to recruit eligible candidates to work in the Indian Railways. RRB Group D exam shall be Computer Based Test (CBT). Railway Administration reserves the right to conduct the CBT in either single or multi stage mode. Candidates qualifying in the CBT shall have to undergo Physical Efficiency Test (PET). It will be followed by Document Verification and Medical Examination. There shall be a negative marking for 1/3rd marks for each wrong answer. This requires deep and complete knowledge of the syllabus. How to prepare subjects in a lucid and comprehensive manner, where to focus, what to study, and time management to clear your exam to achieve your dream job.

Hello Sohan,
The Graduate Aptitude Test in Engineering (GATE) is an examination that primarily tests the comprehensive understanding of various undergraduate subjects in engineering and science. GATE is conducted jointly by the Indian Institute of Science and seven Indian Institutes of Technology (Bombay, Delhi, Guwahati, Kanpur, Kharagpur, Madras and Roorkee) on behalf of the National Coordination Board GATE, Department of Higher Education, Ministry of Human Resources Development (MHRD),Government of India.
The score is used for admissions to various post-graduate education programs (e.g. Master of Engineering, Master of Technology, Doctor of Philosophy) in Indian higher education institutes, with financial assistance provided by MHRD and other government agencies.
it is one of the most competitive exams in India .
ELIGIBILITY :
those have have completed Bachelor's degree are eligible . if completed b.sc then you need to complete m.sc to appear for GATE . if completed b.e , b.tech, b.arch then you are directly eligible.
There is no age limit and attempts for GATE.
You may also refer : http://www.gate.iitr.ernet.in/?page_id=266