Hi Ross,
Yes, you can appear for your 11th and 12th in PCB and sit for entrance exams for MBBS thereafter. The only constraint that might occur is the reintroduction of upper age limit for NEET exam from next year. Only for the current year, the upper age limit for NEET has been removed.
All the best!
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile