Chemistry is a tedious subject and requires a lot of visualization which makes it difficult to comprehend for some. If you are well versed with the type of questions and has practiced last 10-year exam papers, you can confidently attempt all 45 questions. Chemistry is divided into Inorganic, Physical and Organic chemistry. For inorganic chemistry, you must refer to the NCERT. Organic comprises of many reactions and reagents which can be practised by writing over and over again. Physical chemistry requires a comparatively deeper understanding of concepts, so preparing with the NCERT and referring to study material a level higher than NCERT should be the way to go.