To calculate sum() two alias named columns - in sql

To calculate sum() of two temp column names declared in query - in SQL

stud table has only two columns m1,m2. total and total1 is given as temp name.

select 
   m1, m2, 
   SUM(m1) + SUM(m2) as Total,
   SUM(m1) + SUM(m2) as Total1 
from 
   stud 
group by 
   m1, m2

How to calculate grandtotal as sum(total)+sum(total1) with the column name declared as temp name for the query to execute.

With cte dosn't support duplicate column names?

How to make use of it to support duplicate columnname