Five Subjects – Physics, Chemistry, Mathematics, English and Hindi each to be taught for one month from July to November one after the other though not necessarily in the same order by lecturers Palak, Vaishali, Esha, Tisha and Apurva. Palak teaches course Chemistry but not in the month of October or November. Vaishali teaches Physics in the month of September. Esha teaches in the month of July but does not teach Mathematics or English. Which subject is taught by Tisha? Which lecturer’s subject immediately follows after course Chemistry?