Hello student, RT means Reappear in Theory. If a student has appeared in 6 subjects and he/she has one additional subject and gets RT in any one subject, then your result will be shown as PASS because you have cleared 5 out of 6 subjects. Let's take an example suppose a student secured 24/30 marks in practical examination and 10/70 marks in theory examination so the total comes to be 34/100 which means a student secured more than 33%. But according to board guidelines you must get 33% separately in theory and practical examination. That means you have to appear for RT. but it's all up to you you can take admission in the university because your overall result is pass. But it is suggested that you may appear for improvement examination to enhance your result.

All the Best!