Another option is to use INSERT ALL
:
insert all
into students (sr_no, name, class, sec, contact, total_marks) values (1, 'Ravi' , 10, 'A', 12345, 579)
into students (sr_no, name, class, sec, contact, total_marks) values (2, 'Ria' , 10, 'B', 98765, 580)
into students (sr_no, name, class, sec, contact, total_marks) values (3, 'Aditi', 10, 'A', 98498, 570)
select * From dual;
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