Sarkar said the mistakes on coalition politics before and after the 2009 Lok Sabha elections were carefully studied and analysed.
"The CPI-M's mistakes and shortfalls are being rectified," he said, without elaborating.
According to the 65-year-old Marxist leader, the growth of the Aam Aadmi Party (AAP) is unlikely to stifle the Left.
"They are against some corporate groups only. They remain silent against other millionaires. We have been against corruption for years."
The CPI-M leader said the AAP had not unveiled "any concrete alternative policies".
