Hello Ashok,
If you are asking about RRB ALP exam which is conducted for recruitment of Assistant Loco Pilot and Technician in Indian Railways. According to the eligibility criteria, candidate should have completed 3 year diploma in mechanical, electrical, electronics, automobile engineering. So, if you have completed 3 year diploma then you are eligible to apply for the exam.
You can go through the link below to check the detailed eligibility criteria and other details-

https://competition.careers360.com/articles/rrb-alp-2018

Good Luck!

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