Sir i failed in mathematics written exam and i passed in total marks of maths..like i get 36/100 ..sir i will give jee in 2021 and i believe that i will score very good ...sir can i do engineering in this type of marks in 12th board?? sir please reply ...i am in very trouble...

Hello kid,
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That's ok if you have failed as you are planning for giving again I'm 2021. Try your best. Look the more you score the more good college will be opened for admission. The less you score the less reputation college you will get. With such low score nothing is gonna happen. Atleast 97% you should try to score for a better future.
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If you get placed in well reputated college, the college itself offers placements with a good pay scale so always hope for best try for best and except for least