select top n Average in each group sqlite

i need to select the top 3 Average scores from a table of scores with many columns, i tried this query

SELECT StudentID,
       classid,sessionid,termid,classlevelid,
       ROUND( avg( total ) , 2 )  ave
  FROM ResultView r1

  where sessionid=4 and termid=1
 GROUP BY StudentID,classid
 ORDER BY 3 DESC, 2 asc;

which gave

StudentID|classid|sessionid|termid|classlevelid|ave
---------+-------+---------+------+------------+------
5        |8      |4        |1     |1           |56.81                    
6        |8      |4        |1     |1           |58.38                    
7        |8      |4        |1     |1           |56.13                    
2        |10     |4        |1     |2           |68.0                     
3        |10     |4        |1     |2           |72.8                     
4        |10     |4        |1     |2           |73.2                     
5        |10     |4        |1     |2           |70.2  

As you can see, its getting more that 3 for each classlevelid, how do i make it get only the top 3 average for each classlevelid?