Sir i got 51% marks in 10th and 45% marks in 12th can you please tell m the way how i can upgrade this up 60 i?

Today every company asks atleast 60% marks in 10th and 12th so please you suggest me how to update thi %age upto atleast 60%. i am totally confussed and totally under depression.please get back soon with some possible solutions.i will be very thankful to you.