Being familiar with these descriptors will help teachers understand their students’ abilities and target their instruction appropriately. Use the interactive scale below to hear samples of students at different proficiency levels. BEST Plus scores are aligned with SPL descriptors, which range from 0 to 10. Adults being served in federally funded adult ESL programs usually have between an SPL 0 and 6 in oral communication. Here are audio clips of selected SPL levels. A transcript of each audio clip is provided for your convenience.