Hey Nandini.
There are various colleges that provide the three year law course in which the eligibility criteria requires less than 50% marks in your Bachelors degree. Various top colleges like Government Law College, Mumbai  and ILS Pune which fall under MH CET Law entrance exam along with other law colleges from Maharashtra  require more than 45% marks for the general category. Other than this TS LAWCET, various law colleges in Tamil Nadu and AP Law cet which include various law colleges in Andhra Pradesh which also require more than 45% marks in graduation degree to be eligible for admission. Other than this, Panjab University, Chandigarh has also an eligibility criteria that requires more than 45% marks for 3 year LLB degree. You can look up if you fall within the eligibility criteria of these colleges.
Best of luck