Android : Best way to store static nested data(array) in Android?

So I have data, for example:

1 topic will be conducted in 2 class room with different subtopic each hour from 9am-12pm.

It will look like below if in JSON format:

{
    "Mathematic": [
        {
            "time": [
                {
                    "startTime": "09.00",
                    "endTime": "10.00",
                    "class": [
                        {
                            "subtopic": "What is Calculus?",
                            "roomName": "Class A"
                        },
                        {
                            "subtopic": "Basic of Calculus",
                            "roomName": "Class B"
                        }
                    ]
                }
            ]
        }
    ]
}

If I put the json file in res folder, I believe the JSON parser will take some time to parse it.

I also think about to put it in arrays.xml:

<array name="testArray">
    <item>first</item>
    <item>second</item>
    <item>
        <array name="testArrayNested">
            <item>
                first nested
            </item>
            <item>
                second nested
            </item>
        </array>
    </item>
    <item>fourth</item>
    <item>fifth</item>
</array>

I am not sure how to get the nested array, here is my code:

String [] test = getResources().getStringArray(R.array.testArray);
for(int i = 0; i < test.length; i++)
    System.out.println("test: " + test[i]);

Output:

test: first
test: second
test:    first nested   second nested   
test: fourth
test: fifth

What is the best way to store the static data?