Whether you can register for a 3-year LLB entrance in late May depends on the state and the specific university or entrance exam you are targeting. Each state and university in India has its own schedule and deadlines for law entrance exams. Here's a general guideline:

1. Check the Specific Exam or University Deadlines

Entrance exams like MH CET Law (Maharashtra), DU LLB (Delhi University), or university-specific admissions like Punjab University or Andhra Pradesh's law colleges have their own timelines. Most registrations typically close between April and early May, but some universities or states may have extended deadlines or late admission processes.

2. Late Registration or Management Quotas

In some cases, universities allow late registrations with a late fee, or they may have management quotas that you can apply for outside the entrance exam framework.

3. Contact the Universities Directly

If you're trying to apply late, directly contact the admissions office of the university or college you're interested in. They may guide you about possible options or late application procedures.

To confirm whether you can register, please mention the specific state or university you're targeting.