Yes definitely you can apply next year , infact many students drop after there 12th class to prepare for many competitive exams and after one year they apply to pmsss and get good colleges as well.
You cannot apply once you get benefited under pmsss you cannot take the benefits again but yes if you want to take admission next year then don't worry you can apply mext year if you fulfill all the eligiblity criteria.
There are few similar questions which can help you to know more about when and how we can apply to pmsss again.
https://pmsss.in/302/after-joining-the-college-can-i-cancel-my-admission-and-can-i-apply-for-next-year
https://pmsss.in/285/after-cancelling-admission-can-i-again-able-to-apply-for-pmsss
