Im way to long hardstuk in my code C# blazor

C#
1

I try to get the right tables based on a string and user ID for the client inc another table taht belongs to it:

private List GetVocabularyScores(string scoreTableName, string userId)
{
using var db = this._context.CreateDbContext();

        switch (scoreTableName)
        {
            case nameof(Vocabulary1Score):
                return db.Vocabulary1Score
                    .Where(x => x.UserId == userId)
                    .Include(x => x.Vocabulary)
                    .Cast<IVocabularyXScore>()
                    .ToList();
            case nameof(Vocabulary2Score):
                return db.Vocabulary2Score
                    .Where(x => x.UserId == userId)
                    .Include(x => x.Vocabulary)
                    .Cast<IVocabularyXScore>()
                    .ToList();

etc etc

When I up cast it to the interface I get the limited object which doesn’t have the Vocabulary class since all VocabularyxScore has its own Vocabularyx.

public interface IVocabularyXScore
{
int Id { get; set; }
string UserId { get; set; }
ApplicationUser User { get; set; }
int VocabularyId { get; set; }
int Score { get; set; }
int CorrectCount { get; set; }
int IncorrectCount { get; set; }
DateTime? LongTermMemory { get; set; }
}

public class Vocabulary1Score : IVocabularyXScore
{
    public int Id { get; set; }
    public string UserId { get; set; }
    [Required]
    public ApplicationUser User { get; set; }
    public int VocabularyId { get; set; }
    [Required]
    public Vocabulary1 Vocabulary { get; set; }
    public int Score { get; set; }
    public int CorrectCount { get; set; }
    public int IncorrectCount { get; set; }
    public DateTime? LongTermMemory { get; set; }
}

etc etc.

Now Ive rewatched some entity framework course of Mosh and im trying groupjoin and then adding it to an object.