self confidence

freedom from doubt; belief in yourself and your abilities; "his assurance in his superiority did not make him popular"; "after that failure he lost his confidence"; "she spoke with authority"

मै 10TH में अवश्य सफल होऊंगा ये मेरा आत्मविश्वास है

I HAVE SELFCONFIDENCE THAT I WILL BE SUCCESS IN 10TH CLASS.