Yes, you can take PMS-2018. As your age on 1st of January, 2018 will be 27 years 11 months 28 days, so you can appear in PMS-2018. Anyone who is not a government servant and is below 28 years of age can apply for 2018. As PMS has been regularised, the advertisement will be out in Oct/Nov. 2018 and written examination will be conducted in december 2018. Owing to limited number of seats every year, there is a cut throat competition in PMS as well. So gird up your loins. Best wishes to you all.