Listing Custom Post Post from certain category

This can be achieved with Multiple Taxonomy Handling. Try this code.

<?php
 $args = array(
    'post_type' => 'note',
    'tax_query' => array(
        array(
        'taxonomy' => 'category',
        'terms'    => array( 'class 11', 'chemistry' ), // Add suitable term slugs here
        'field' => 'slug'
        )
    )
);

$my_query = new WP_Query( $args );

if( $my_query->have_posts() ) {
    while ($my_query->have_posts()) : $my_query->the_post(); ?>
        <p><a href="https://wordpress.stackexchange.com/questions/204461/<?php the_permalink() ?>" rel="bookmark" title="Permanent Link to <?php the_title_attribute(); ?>"><?php the_title(); ?></a></p><?php
    endwhile;
}

wp_reset_query();
?>