Demonstrating Basic Computing Knowledge

I have the opportunity to apply for a digital forensics position that will train. There is no digits forensic experience required.
That being said, it is very competitive. If I wanted to gain some tangible skills to demonstrate I have some knowledge of computing, would you recommend getting CompTIA A+, S+, N+? Any others? I know these do not necessarily correlate directly with digital forensics.

computerforensics computing