Hello Aspirant
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If you want to pursue btech after 12 in top government Colleges like IITs and nits. You should be qualified in jEE mains and jEE advance.
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If you want to pursue in private universities/ Colleges you should be qualified in their respective Colleges entrance exams.
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If you provide the information what you want to after 12th .I will provide the information for sure.
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If you have any questions further let me know.
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Thank you!!