I never had experienced KRL test but one of my friend gave it last year.. so i want to share his experience with all of you..
According to him:
it was all subjective MCQs and no IQ/English and No negative marking. They will conduct interview on the same day. only those who will clear the written test will be able to give interview..
bring original documents, pen (blue/black), calculator, original CNIC, call letter

Good luck guys