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