"We demand an inquiry by a High Court judge. If the investigation is proper, then the culprits will be known," Bose told reporters here.
Alleging that the culprits were close to Trinamool MPs Kalyan Banerjee and Abhishek Banerjee, he said "Trinamool Congress is linked with the question paper leak."
Bose said by promising jobs, the culprits have earned crores of rupees.
"Who can say there will be no further question paper leaks?" the CPI(M) Politburo member asked.
On the police action on August 27 last when Left Front leaders, including he (Bose), got injured during a march to the state secretariat, the Left Front chairmna said had there been no provocation from the authorities, the incident would not have happened.
He also alleged that the government was doing politics in distribution of forms related to Food security Act following floods in some districts of West Bengal.
"Left Front councillors are being given very few forms, while Trinamool councillors were handed over large number of forms. There is politics in distribution. We had also asked for extending the last date for form distribution from August 31 to September 30, but got no response," Bose added.
