I just started learning film. I have bought a Pentax KX, but I'm looking forward to get a rangefinder in the future, but it has a faulty meter so I need to master the sunny 16 rule. I had my first roll of film developed and scanned but only 13 shots out of 36 were developed

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Under/Overexposed ba kapag ganon?
Basically, I use the sunny 16 rule, and set my shutter speed to the reciprocal of my iso. If I want to use a certain aperture, I also change my shutter speed accordingly. About the iso, I only follow the iso rating on the film. Any tips to improve my exposures?

Thank you!
