Are these achievable?

If you want the fields to be editable and update as the user types you should handle the Change event of the form and Execute the following Code:

this.form0.form.patchValue({BillingName: ${event.value}})

and with the following Condition:

${} == 'Name'

form0 - the Name property of your form component.
BillingName - the Property which should be updated (the calculated one)
Name - the Property whose value is used to update the calculated one.

For the ratio it should be something similar:

Code: this.form0.form.patchValue({Ratio: 2 * ${event.value}})
Condition: ${} == 'NumberOfStudent'

I am attaching a sample page. You can unzip it somewhere and import it in Radzen using the Import button from the 'My Applications' screen. (5.5 KB)

By the way what do you mean by 'could i have running number for student ID'? If you want to use autoincrement ID - yes you can. All you have to do is configure that in your database.