Question Groups fixing score

Dear All,

Can any one help me on the following.

QG: Question Group

I need to create a quiz with two question groups, each consists of 10 questions each. I have created a Question group(QG) one as mandatory. Hence i have included all the questions. in QG2 i have included 5 questions. In total learner has to complete 15 questions in the quiz.

My problem is, the minimum passing score is 80% for the entire quiz which includes both the QG1 and QG2. In that employee has to get  minimum of 80% in the QG1 and the balance score in the QG2, consolidating the two score the employee has to get a total of 80% to pass the assessment.

In brief if i am passing the assessment with the score of 80 the ration should be 64+16 (i.e, in QG1 - 64 + QG2 - 16). Which means learner has to get 80% in the QG1 to pass the assessment. Is it possible.

Please do write in case of any clarification.

Regards,

Ramesh.P