Switching from a different undergraduate program to an LLB is possible, but it depends on the institution’s policies and the education system in your country. In many countries, you can pursue a three-year LLB after completing a bachelor's degree in another field, or a five-year integrated LLB program directly after high school. If you're currently enrolled in another undergraduate program, you may need to apply for fresh admission to an LLB program, as most universities don’t allow direct transfers between unrelated fields.
Admission requirements vary, so you should check with the university offering the LLB program. Some institutions may require entrance exams like CLAT, LSAT, or university-specific tests. If you've already completed part of your current degree, consider whether transferring credits is an option. It's also important to assess how switching aligns with your career goals in law and whether additional qualifications may be needed later.