APT Test varies for the subjects that you want to study B.Tech in. If you want to take up B.Tech in CSE, your subjects will be Physics and Mathematics for 30 minutes each. The Physics and Mathematics will be at 12th level. The questions will be of MCQ type. There is no negative marking either. So what you answer is what you score. Now stick to NCERT books and get all the formulae and basics correct. That way you can score good easily. For more information, please visit the official website: https://snu.edu.in/international-partnerships/international-admissions/undergraduate/details-snusat-and-apt