Hi and welcome to the forum! I am glad that I can help you.
You would like to know whether there is a cure for bad breath.
Bad breath may occur in one of the following conditions: dental problems (poor dental hygiene, periodontal disease, gingivitis), dieting, dry mouth, systemic (bodywide) illnesses (such as diabetes, liver disease, kidney disease, lung disease, sinus disease, reflux disease), food containing volatile oils (onions and garlic), medications, nose, mouth and throat conditions, psychiatric illness ("pseudohalitosis."), tobacco products, etc.
According to the data that you described, you do experience bad breath. You may consider paying a little bit more attention to the oral hygiene by brushing your teeth twice a day, cleaning the tongue and flossing. You may also consider chewing gums or taking breath mints. You should be drinking at least 10-12 glasses of water per day, which means drinking water even at school. If your gums bleed during brushing of your teeth, take Vitamin C to avoid bleeding.
Please keep in mind that I provide medical information only. I am not able to diagnose medical conditions online. Please contact your doctor for further advice and information about treatment options.