Ans: There are a number of reference books that students can use for ICO 2022 exams that will help them score higher marks and these study materials include the following:ICO level 1 2016: Set AICO level 1 2016: Set BICO level 1 2017: Set AICO level 1 2017: Set BAnswer keys to all of these question papersClass 11 ICO 2 yearsClass 12 ICO 2 yearsBoth the 11th and 12th standard students can refer to the question papers and books mentioned above based on their standards. However, the standard syllabi remain the same which means that the CBSE, ICSE/ ISC, and State board syllabus will be followed. All you need to do is follow the syllabi given in the books and understand the concepts better via Vedantu to get all your doubts cleared.