As per my knowledge, there are no new dates release by the Gujarat Police Bharti Board Recruitment for Police Sub Inspector (PSI) exam but the last year the PSI exam was held on 13th Dec 2014 So probably this year the date of exam will be near it.

Till than prepare for the exam.

Exam pattern:

Paper I Gujarat Language 75 Marks
Paper II English Language 75 Marks
Paper III General Knowledge 100 Marks
Paper IV General Laws 100 Marks

Exam Syllabus

Gujarat Language:

Gujarat Grammar,
Verbal Ability,
Vocabulary,
Comprehension etc.

English Language:

English Grammar,
Verbal Aptitude,
Vocabulary,
Comprehension,
Idioms etc.

General Knowledge:
Current Affairs
Psychological Matters
General Knowledge
Current Affairs
Psychology, History
Geography
Sociology
Science

General Laws:
Constitution of India,
Criminal Procedure Code1973,
Indian Penal Code 1860,
Evidence Act 1872,
Gujarat Police Act 1951 etc.