For your testing, just know that since you have a script that runs onChange of field 1 and depends on field 2, that field 2 must be populated before field 1.  Once you get this working add an exclusion to not run if field 2 is empty, or whatever fits your use case, then create a similar script onChange of field 2 so that no matter what order the 2 fields are populated in, the script will still run.

As far as why it's not working, you'll have to add some alerts on f1 and f2 which will confirm that those field names are correct, and the value you are testing for (newValue/f1 and f2) is expected.  It doesn't make sense to clearOptions then removeOptions for individual choices, so do one or the other as clearOptions will remove all options.  If you take this line out, make sure 'Test' is the value of the choice record, not the label.