It's very uncommon to pursue an MSc and an LLB concurrently. The programs are significantly different in their content and workload. An LLB (Bachelor of Laws) is a professional degree requiring a substantial time commitment, typically 3-4 years. An MSc (Master of Science) is also a demanding postgraduate degree, usually taking 1-2 years. Attempting both simultaneously would create an extremely heavy workload, likely resulting in a compromised performance in both.
While some universities might offer *overlapping* modules or allow some credit transfer between related programs, a fully concurrent study of an LLB and an MSc is practically infeasible for most students. You would generally need to complete one degree before starting the other.