what are the chances of getting central govt jobs of bc e and obc .who get preferred first??

Hello,
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Getting a central job is not based on caste category.
Jobs are approved for them who is a merit among a group of students.
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There will be reservations for jobs, and  those reservations just say that this Many candidates can get a job.
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For example, If you are SC and got 70 marks some other candidate is OC he secured 100 marks, then first preference goes to OC candidate who secure more then You.
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Hope you understood. One who secures a greater percentage will be given 1st preferance.