Stock Illustration: Boys and girls who don't know what to study and have a question mark on their heads

younger　 studying　 vector　 vectors　 brat　 kids　 person　 learning　 study　 contemplation　 worried　 worry　 difficult　 dislike　 don't understand　 let me see　 misty　 hate　 boring　 vain　 suffer　 have trouble　 be perplexed　 have difficulty　 be in trouble　 be in difficulties　 have a hard time　 be troubled　 be distressed　 be put out　 be inconvenienced　 be worried　 be bothered　 be stumped　 rest one's chin in one's hands　 put the elbow on　 rest the elbow on　 school　 coaching school　 take lessons in　 cramming school　 grinning　 smiling　 smilling　 hold out　 be persistent　 do one's best　 persist　 stand firm　 try one's best　 happy　 enjoying　 fun　 joyful　 enjoyment　 hilarious　 joyfulness　 merry　 enjoy　 enjoyable　 pleasing　 Convivial　 illustration　 yellow　 gray　 two colors　 simple　 desk　 pencil　 pencils　 lead pencil　 notebook