Hi aspirant,
Don't worry and do not feel stressed about it.
You can reappear in two failed subjects of your 12th standard science stream from GSEB Board.
To reappear in two failed subjects, you have to apply for supplementary examinations by contacting your school principal. You have to fill the application form and pay the examination fee to apply for supplementary examinations. You have to study well to qualify the failed subjects of your 12th standard  by appearing in the supplementary examinations.

Study well and come out with flying colours this time to secure your future which is in your hands ultimately.
Hope it helps
Good luck

hello aspirant,

see ups and downs in life comes in every mans life. can you please tell me from which board you have attemted your hsc. then i will do some researches and then i can tell you.