hi,

see ssc chsl or ntpc railway exam has no link with UPSSC PET exam. you may apply distinctly for ssc chsl or ntpc exam with out appearing in upsssc pet. however for each of the examination you have to follow the previous years questions structure and difficulty level. for ssc chsl, exam duration is one hour and has 100 mcq questions on quantitative, english, reasoning and GK. so by practicing you have to be quick at calculation answer most of the questions in due time.

NOW COMING to rrb ntpc, questions formed on general awareness, mathematics, general intelligence and reasoning of total of 100 marks.

do follow the previous years papers and standard book for section wise questions practice. you may follow rs agarwal for mathematics or quantitative and reasoning, bankers adda magazine or arihant book for gk.

hope it would help.