The British Raj charged him and his brother, Matrika Prasad Koirala, with having contacts with terrorists in 1930. They were arrested and set free after three months. Because of this, Bishweshwar began to study at the Scottish Church College in Calcutta as per his father's wishes. Towards the end of 1930, he left college and returned to Banaras. In 1932, he completed his intermediate level of studies. His father again insisted that his son join Scottish Church College in Calcutta. So for the second time, he joined the college, but left it soon afterwards. In 1934, he completed his bachelor's degree in Economics and Politics from Banaras Hindu University. He also earned a degree in Law from the University of Calcutta in 1937, and practised for several years in Darjeeling.