For JNU Entrance exam in Foreign language 

Reasoning - coding and decoding (alphabetical).blood relation , direction and ranking test .English- basic grammatical rule , vocabs , reading comprehension and passage .read the pasagae and add additional article on the Hindu .esay and paragraph may carry 20-30marks .English ReasoningGeneral knowledge Comprehension are some of topics .Also refer previous year papers.Thanks.

and do you know how many questions comes in exam

Sure ...
Reasoning - 15 (20marks)
Artificial language -2(10marks)
Reading comprehension -1(10marks)
Grammar -3 (10marks)
Essay question -1 (20marks)
Universtiy and you - 1(15 marks)
Opinion -1 (10marks)
Language - 1 (5 marks)

15+2+1+3+1+1+1+1=27 question .
Including sub branch questions...

Thank You