They asked me to take a skilled craft battery exam for a job what is this exam what should i study?

I can't give you the correct answer but I found a example of a skilled craft battery exam. So just go to this web address the click on requirements, then close to the bottom of the 1st paragraph click on ( see example ) .

http://www.unionpacific.jobs/careers/explore/trade/elec/ap_diesel_elect.shtml