TRANSFER DATA FROM MY TABLE EXCEL TO A USERS IN HTML

I AM A DEVELOPPER BEGGINER I HAD A WEBSITE TO CREATE US A PLATEFORM FOR STUDENTS AND EMPLOYEES
I HAD ISSUES I CAN’T FIND THEM FIRST OF ALL I AM CREATE A FUNCTION THAT UPLOAD A FILES ONLY FOR XLSX , XLS WHICH IT EXCEL FILES ONLY US I CREATE THE WEBSITE FOR STUDENT AND EMPLOYEES I WANNA SHARE TRANSFER EVERY MARK FOR EVERY STUDENTS. I HAD CREATE THE WEBSITE WITH HTML PHP CSS JAVASCRIPT AND PHP ALSO MY SQL AND I MAKE THE ACCESS FOR STUDENT NOT LIKE EMPLOYEES ANY HAD REGISTRATION TABLE IN MYSQL… I DON’T HAVE ANY ISSUES US UPLOAD A EXCEL FILE AND SHARE OR DISPLAY MARKS FOR EACH STUDENT I HAVE ….
I BUILD THIS WEBSITE FOR ME US AM EMPLOYEER AND FOR THE EMPLOYEERS WHO’S WORKING WITH ME AND FOR MY STUDENTS , I ALSO HAVE MANY CLASSES