There aren't any nulls present. I assume you meant zeros.
I also assume that you don't want to see a report group for any individual who has all zeros.
The query below will omit any record with all zeros.
Code:
SELECT Master.ID, Master.Reg_date, Master.Reg_Type, [fname] & " " & [lname] AS Name, Master.CountryA, Master.CountryB, Master.Graduate, Master.Pass_A_28Nov, Master.Pass_A_29Nov, Master.Pass_A_30Nov, Master.Pass_B_28Nov, Master.Pass_B_29Nov, Master.Pass_B_30Nov
FROM Master
WHERE (((Master.CountryA)>0)) OR (((Master.CountryB)>0)) OR (((Master.Graduate)>0)) OR (((Master.Pass_A_28Nov)>0)) OR (((Master.Pass_A_29Nov)>0)) OR (((Master.Pass_A_30Nov)>0)) OR (((Master.Pass_B_28Nov)>0)) OR (((Master.Pass_B_29Nov)>0)) OR (((Master.Pass_B_30Nov)>0));