hi,

eligibility to appear in isc compartment exam is students who have passed in english and any two subjects, however you can appear for the subject n which you have failed. see if you take it positively and dont get depresses you will get outstanding result. 10+2 results is really important for your future career and it will lead your next career. so it will be good for you if  you study hard and make the best use of the time which you get, many of the students take year gap after 12th to study for many competitive exam, so if you can make plans for your future studies also.