Put this code in the functions.php, in plugin, or other places which can be executed.
function st_quiz_block_category( $categories, $post ) {
return array_merge(
$categories,
array(
array(
'slug' => 'pte-quiz-cat',
'title' => __( 'PTE Quiz', 'pte-quiz' ),
),
)
);
}
add_filter( 'block_categories', 'st_quiz_block_category', 10, 2);
Then you need to attach a block to this type that you can see the result.
blocks.registerBlockType( 'pte-quiz/speaking-asq', {
title: __( 'Speaking:ASQ', 'pte-quiz' ),
icon: 'universal-access-alt',
category: 'pte-quiz-cat',
} );