Query in azure cosmos DB

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Azure

I have database somting like:
{
StudentTests:[
Test1:{Subject1:"s1",Marks:65},
Test2:{Subject2:"s2",Marks:55},..,..
],
StudentId:"1",
StudentName:"A"
},
{
Student2
},
{
Student3
},
and so on
Total 100 Documents.

What I have tried:

I was querying like to find highest marks among subject1. So, that I achieved using query : select MAX(s.marks) from c join STests in c.StudentTests join s in STests.Test1

But that is returning me just a value of maximum of marks of subject1. I wanted to find the max value with student max marks. Somthing like :
{StudentId : "5", Marks : 99}

So Is it possible to join marks with id?