Passing types to function in c#

I am using .net core 2.1 with entityframework core.

I have different models/entities/types defined in my project. e.g. Student, Class, Teacher.

I am getting the table data for these models to set in my cache.

At the moment, I am doing this;

string[] tablesToBeCached  = { "Student", "Class", "Teacher" };

foreach(var table in tablesToBeCached)
{
     cache.Set(key, GetTableData(dbContext, table));
}

and the function GetTableData() is defined as follows;

public IEnumerable<object> GetTableData(DBContext dbContext, string tableName)
{
      switch (tableName)
      {
          case "Student":
              return dbContext.Student;

          case "Class":
              return dbContext.Class;

          case "Teacher":
              return dbContext.Teacher;

          default:
              return null;
       }
  }

I want this code to be smart and short.

I tried following, but didn't work; (The error is 'x' is a variable but is used like a type)

List<object> entities = new List<object> { typeof(Student), typeof(Class), typeof(Teacher) };
entities.ForEach(x => GetTableData(x, dbContext));

public IEnumerable<object> GetTableData(object x, DBContext dbContext)
{
     return dbContext.Set<x>();
}

Can someone please help? Is it even possible in C#?