Where Mahatma Gandhi Completed his Law Degree?

He finished his law in England. Also you have asked so many facts, you should read his book The Story of My Experimentswith Truth to find all the answers in detail.

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Mohandas Karamchand Gandhi was born in the town of Porbander in the state of what is now Gujarat on 2 October 1869. He had his schooling in nearby Rajkot, where his father served as the adviser or prime minister to the local ruler. Though India was then under British rule, over 500 kingdoms, principalities, and states were allowed autonomy in domestic and internal affairs: these were the so-called 'native states'. Rajkot was one such state.

Gandhi later recorded the early years of his life in his extraordinary autobiography, The Story of My Experimentswith Truth. His father died before Gandhi could finish his schooling, and at thirteen he was married to Kasturba [or Kasturbai], who was even younger. In 1888 Gandhi set sail for England, where he had decided to pursue a degree in law. Though his elders objected, Gandhi could not be prevented from leaving; and it is said that his mother, a devout woman, made him promise that he would keep away from wine, women, and meat during his stay abroad. Gandhi left behind his son Harilal, then a few months old.

In London, Gandhi encountered theosophists, vegetarians, and others who were disenchanted not only with industrialism, but with the legacy of Enlightenment thought. They themselves represented the fringe elements of English society. Gandhi was powerfully attracted to them, as he was to the texts of the major religious traditions; and ironically it is in London that he was introduced to the Bhagavad Gita. Here, too, Gandhi showed determination and single-minded pursuit of his purpose, and accomplished his objective of finishing his degree from the Inner Temple. He was called to the bar in 1891, and even enrolled in the High Court of London; but later that year he left for India.