Updating Table with a form

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Center for technica education

I have Two Tables ,a Student Name Table with Two Fields, Student Id and
Student Name the other table is a Rubic Table and has the same two fields
along with other fields. I have created a form with a combo box(Names) on the
form and I am trying to get the Name and the Student Id to be entered into
the into the Rubic Table fields but I can't seem to get the Student Id to be
entered. I know I am doing something stupid but I can't seem to make it work.
Thank you in advance for all the help. You guys are great.