Dharmsinh Desai University has not yet released any notification related to branch change on its official website. You will have to contact the college to know if the branch change option is still available. Then only you can change your branch to BTech Instrumentation and Control at DDU Nadiad.
It is uncertain whether you would be admitted to Dharmsinh Desai University, Nadiad, with an ECE rank of 11690 in your home state. The number of applicants and the cumulative performance of the candidates affect the DDU Nadiad cutoff rank for ECE each year. The cutoff rank for the home state quota for ECE at DDU Nadiad in the 2021–22 academic year was 8800. However, in 2023, the cutoff rank for ECE is probably going to be higher. This is due to the fact that more candidates are expected to apply for engineering positions in 2022–2023.