For general fitness wrist curls will be a waste of time as it doesn't really transfer to anything in the real world, nor will you get much hypertrophy from the low volume. If you want something for your forearms, farmers walk will be a lot more useful as it trains your grip in a way that transfer nearly 1 to 1 with normal life activities.

Likewise, calf raises isn't needed, walking should be plenty of stimulus for your calf if you aren't aiming for hypertrophy.

The biggest issue with the program though is that it is completely missing what's maybe your most important group of muscles, your back. You'll want an exercise or two that trains your pulling muscles (other than the biceps). Deadlifts are great (and healthy) if you have a bar available. Dumbbell/barbell rows are great exercises, pull ups too if you got the strength. If pull ups are too difficult at the moment, you could try training only the eccentric portion of it until you get better at it.