Opposition parties must prioritise their coalition first if they were to succeed at the upcoming polls, said former premier Dr Mahathir Mohamad.

"The opposition coalition (component parties) must learn to help one another. (They must) not only think of their own party but to think of the coalition.

"It is the coalition that must win. Don't think about the party anymore," Mahathir told a fund-raising event for the Lembah Pantai PKR division in Kuala Lumpur last night.