Yes, it is possible for a student to switch their admission from ICSE (Indian Certificate of Secondary Education) to CBSE (Central Board of Secondary Education). However, the process may vary depending on the policies and guidelines of the individual schools. Generally, the student would need to obtain a transfer certificate from their ICSE school and submit it along with other necessary documents, such as academic records, birth certificate, and address proof, to the CBSE school they wish to join. The CBSE school may also have specific requirements, such as appearing for an entrance test or an interview. It is advisable to directly contact the CBSE school for detailed information on the specific process and requirements.