First and foremost, gain admission into the CSE program for IoT, Cyber Security, and Blockchain Technology typically requires one to follow these several steps: To begin with, you have to ensure that your basic eligibility criterion is fulfilled in terms of getting a high school qualification with an intense background in areas such as mathematics, physics, and computer science.
Many institutes require an entrance exam which, for India is JEE Main and other states/country-level exams. Once selected and ranked at a good scale, you could get admission in numerous universities and colleges that allow specific courses in the subject of CSE with specialized emphases such as IoT, Cyber Security, or Blockchain.
Once one gets shortlisted, he or she has to undergo rounds of counseling or interviews that most institutions provide. Some colleges directly offer admission through merit. Finally, some technological colleges are actually collaborative programs with tech companies, so students get practical exposure to these advanced technologies. That is directly related to the particular requirement of the institutions you see an interest in.