dummy regression with polytomous variable


I want to perform a linear regression analysis. My DV is continuous (score between 0 and 6), and my predictors are:
- one dichotomous variable (native vs. non-native)
- one continuous variable (%)
- one dummy variable with 5 levels (five different countries)

Is there anything special I should be cautious with?

Furthermore, I am not sure my data meet the homoscedasticity assumption. Here is my plot.

Many thanks!
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