I need to write query that finds the average for each classname, total average for each student, I already wrote two separate query for each one of those, but how to combine to one query?

My 1st query:

select distinct  StudentFirstName,StudentLastName, ClassName, avg(Grade) as 'average for this subject' from tests  inner join students on tests.StudentID=students.StudentID group by StudentFirstName,StudentLastName,ClassName; 

My 2nd query:

select distinct  StudentFirstName,StudentLastName, avg(Grade) as 'total average' from tests  inner join students on tests.StudentID=students.StudentID group by StudentFirstName,StudentLastName; 

Students table:

  pk-INT           VARCHAR             VARCHAR +-----------+------------------+-----------------+ | StudentID | StudentFirstName | StudentLastName | +-----------+------------------+-----------------+ |         1 | agam             | rafaeli         | |         2 | amir             | aizinger        | |         3 | avi              | caspi           | |         4 | avia             | wolf            | |         5 | ben              | moskovich       | |         6 | chen             | segalovich      | |         7 | dana             | levy            | |         8 | daniel           | marcus          | |         9 | daphna           | chwarts         | |        10 | david            | cohen           | +-----------+------------------+-----------------+ 

Tests table:

  PK-VARCHR    PK-VARCHR     PK&FK-INT   INT +------------+------------+-----------+-------+ | TestDate   | ClassName  | StudentID | Grade | +------------+------------+-----------+-------+ | 2017-07-01 | Algebra    |         1 |    88 | | 2017-08-02 | Algo       |         1 |    97 | | 2017-09-01 | Algebra    |         1 |    80 | | 2017-09-01 | Algebra    |         1 |    97 | | 2017-09-01 | Set-theory |         1 |    85 | | 2017-09-04 | Calcules   |         1 |    86 | | 2016-05-03 | Set-theory |         2 |    84 | | 2016-07-02 | Calcules   |         2 |    89 | | 2016-07-04 | Algo       |         2 |    83 | | 2016-07-05 | Algebra    |         2 |    79 | | 2016-06-03 | Algebra    |         3 |    99 | | 2016-07-02 | Algo       |         3 |    97 | | 2016-07-03 | Calcules   |         3 |    96 | | 2016-09-03 | Set-theory |         3 |    95 | | 2016-06-03 | Algebra    |         4 |    78 | +------------+------------+-----------+-------+