Nice lot of
plants! I don't recognize the names for 3, 5, and 7. Do you know their scientific names? For soil, I always get a good quality general potting soil (NEVER one with added fertilizers) and mix in various things of my own; drainage material, grit, sand, leaf compost, pine needle compost, ..., whatever the particular
plant wants. When I repot, I don't shake off all the old soil or break up the root ball, just a gentle shake to get rid of any loose bits without damaging the root ends. I wait about 3 days before watering in the new pot, so any broken ends have time to scab over and won't rot. I don't happen to grow pothos, so someone else will have to talk about its specific soil preferences.