Hi,
You can find admission scores on UHR:s webpage here: https://www.uhr.se/studier-och-antagning/antagningsstatistik/. But I think you can also contact the universities you want to apply to if you have a hard time finding them. In the meantime just do your application on Anytagning.se since admission scores will vary from year to year you can't rely on the statistics too much.
You can contact Komvux in the municipality where you live to get more information on what you could do for your grades there. But the easiest way for you would probably be to do högskoleprovet. So check out the information here on that: https://www.studentum.se/bli-student/hogskoleprovet/.
Sincerely/ Petra