The eligibility criteria for various universities vary. Because IGNOU is a recognized university, you can certainly apply for admission to pursue LLB if you take the CET.
The Bar Council of India does not recognize law degree programs completed through distance education, so IGNOU does not offer 3-year LLB, BA LLB, BBA LLB, or LLM programs. It should be noted that no entrance exam is required for IGNOU law programs (except for Ph.D. in Law). Candidates must simply register for IGNOU law programs by completing the application form and submitting their application fee, as well as the course fee.