can i switch from regular to du sol after 1 st year pass
Yes, a regular student can migrate to SOL. The student must meet the requirements laid by the university. But you cannot migrate from university other than delhi university for migration in 2nd or 3rd year. You can use the provided link to get more information about migration.
https://sol.du.ac.in/solsite/Admission/Adm_Migration.aspx
Hope this helps !