in 1945, Lim and his family returned to their house only to realise that it had been razed to the ground. Lim's father leased a new plot of land in Kampong Rambah, where he built a new house and restarted his provision shop business. Lim then returned to Pei Chun to complete his primary school education. As with most of his cohort who had to stop school because of the war, he graduated only at the age of 15. As there were no secondary schools in Pontian at the time, Lim's parents had to first get Lim to work temporarily as a shop assistant, and also to get Lim's brother, Lim Chin Kiat, to stop his schooling. He was then able to afford to continue his studies in Singapore at Catholic High School in 1949. Chinese High School and expulsion Lim did well enough in his first semester at Catholic High School that, together with an appeal from his father, he was able in 1950 to transfer to The Chinese High School, then the premier Chinese medium school in Singapore. Lim was by then 17 years old, and distracted in his studies by numerous events: the victory of the Communists and the proclamation of the People's Republic of China; the African anti-colonial movement; and the ill treatment of students, particularly of Chinese descent, in Singapore. These were factors which influenced Lim to join the Anti-British League (ABL), an anti-colonial organisation that received instructions from the Malayan Communist Party. With the support of the ABL, and with his classmate and later political partner, Fong Swee Suan (1931–2017; ), Lim organised a successful boycott of the Chinese junior middle school examinations in 1951. The examinations were deemed pointless as it was primarily meant for students who wanted to further their studies in China, even though all universities were closed to Malayans since the People's Republic of China was established. This attracted the attention of the Special Branch, who held him in custody for a week. When he was released, he was expelled by The Chinese High School. Involvement with trade unions The Special Branch would keep Lim under close watch even after his release and expulsion from school. He tried to learn some English at the Eastaff English School, and then worked as a part-time teacher, but under the name of "Mr Yu". Between 1953 and 1954, Lim then became more involved