And I found this:

https://alison.com/courses/Introduction-to-Swedish

It's also free. Even better!

http://www.hum.uit.no/a/svenonius/lingua/flow/co/gram/rfgrsv/rfgrsv.html

http://www.folkuniversitetet.se/In-English/Language_Tests/

http://www.swedishlanguagetraining.co.uk/selfassessment.html

The first and second sites have online assessments to determine placement level. I don't think they are free, but they may be able to help you.

The third site also has an assessment, but I haven't taken that one yet.

Could not comment on substance OP's query, but might I proffer the suggestion of using Duolingo's Swedish in the interium so as to provide a foundation?