With an 85.6% in PCM, you have a good academic score for the Integrated M.Tech in Software Engineering at VIT Chennai. However, admission also depends on factors like your rank in the VITEEE entrance exam, as well as the course's specific cut-off for that year. VIT's cut-off ranks can vary based on the number of applicants and the competition. It's best to check the official VIT counselling details or contact their admissions office for more accurate information about your chances.