how can I get job soon after completing the 12

Hello,
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If you are in a need of job after 12, then you will be having very less job profiles to find.
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You can give a try for government jobs like,

• Railway
• constable
• AR
• Army
• Merchant navy etc

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If you want private jobs you have,

• Content writing
• Tutor
• Data entry
• call center
• Primary school teacher etc,

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If you get selected for any of the job and want a promotion then you will be in need of graduation certificate. Without it you will be in the same post with same salary package.
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You can find jobs by attempting interviews in known companies, with someone's recommendation. You can also find Jobs through news papers.