The functions in Excercises.ml can be run in the OCaml toplevel (The docs https://ocaml.org/docs/toplevel-introduction)
To run toplevel use utop command:
utop
To import file run in utop:
#use "Exercises.ml";;
Now you can call functions from the Excercises.ml
To quit utop press Ctrl-D (end of file) or enter #quit;;
#quit