Looking for technical dictionary japanese/english

Hi all, I hope this post is appropriate amd someone can help me.

I intend to pass the 電気工事士 exam next year but my biggest obstacle is the reading, so I'm looking for a dictionary that covers most electrical/carpentry words and can help me pass the exam more easily.
Does anyone know some books?
I'm looking on the internet but have difficulties in finding anything useful.

Thanks!