How to track changes of a property of a model

I have this properties on my model.

public class Student : BindableBase
{
	 public Guid Id { get; set; }
	 public string Fullname { get; set; }
	 
	 private bool _isSelected;
	 public bool IsSelected { get => _isSelected; set => SetProperty(ref _isSelected, value); }
}

And in my ViewModel basically loads all the students and assigned it into the Collection.

public ObservableRangeCollection<Student> Students { get; } = new();
private List<Guid> SelectedIds { get; set; }

public override async Task OnActivatedAsync()
{
	 var results = await _service.GetAllStudents(take: 100);
	 Students.ReplaceRange(results);
}

And in my Xaml

<CollectionView ItemsSource="{x:Binding Students}">
	<CollectionView.ItemTemplate>
		<DataTemplate x:DataType="vm:Student">
			<StackLayout>
				<StackLayout Margin="0,20" Orientation="Horizontal">
					<CheckBox IsChecked="{x:Binding IsSelected}" />
					<StackLayout>
						<Label
							FontAttributes="Bold"
							FontSize="17"
							Text="{x:Binding Fullname}"
							TextColor="{x:StaticResource ColorBlack}"
							VerticalOptions="Center" />
					</StackLayout>
				</StackLayout>
				<BoxView HeightRequest="1" Color="Gray" />
			</StackLayout>
		</DataTemplate>
	</CollectionView.ItemTemplate>
</CollectionView>

Now what I want to achieve is that whenever I select an item I want it to be added to a new List of items object right away. But for now I don't have an idea how to do such thing.

Any help is much appreciated.

Thanks in advance

I can check who among of the students that has IsSelected = true by using Linq but this is during Save button. But what I wanted to do now is during check and uncheck it is being added/remove in a new List<Guid> object, which is I'm having a hard time how to implement.

You must binding property 'SelectedItem' of CollectionView to property in model:

<CollectionView ItemsSource="{Binding View}" SelectedItem="{Binding> SelectedItem, Mode=TwoWay}"> 

And property in model:

public Student SelectedItem  
{   
   get 
   { 
       return selectedItem; 
   }   
   set   
   { 
       selectedItem = value;
       DoSomeActionWithSelectedItem(selectedItem);   
   } 
} 
private Student selectedItem;

private void DoSomeActionWithSelectedItem(Student student) 
{ 	
..... 
}

In function 'DoSomeActionWithSelectedItem' you can add to list etc.