Many universities has been introducing a more flexible admissions arrangement so that HKDSE candidates who perform below par in one subject will still have an opportunity for further studies.

More details please visit the official website of the universities:

Flexible Admissions Arrangement of the University of Hong Kong

Flexible Admissions Arrangement of the Hong Kong University of Science and Technology 

Flexible Admissions Arrangement of the Chinese University of Hong Kong

Flexible Admissions Arrangement of the City University of Hong Kong 

Flexible Admissions Arrangement of the Hong Kong Metropolitan University

Candidates may refers to Flexible Admissions Arrangement for JUPAS Candidates (Chinese only) by Hok Yau Club as well. 

Sources:

Official website of universities

Hok Yau Club (Chinese version only)

(The latest announcement by the official website of the universities shall prevail.)