Hi Shivangi. PG diploma for BAMS is a two year long course. I am listing below the specialities for PG diploma courses after completing BAMS-

• Ayurvedic Pharmaceutics
• Twak Roga
• Ayurvedic Dietetics
• Panchakarma
• Prasuti evam strirog

As you asked, the following colleges in Gujarat offer PG diploma courses

• Gujarat Ayurved University, Jamnagar
• Parul Institute of Ayurved, Vadodara
• JS Ayurveda College, Nadiad
• Institute for Post Gradudate teaching and research in Ayurved, Jamnagar

Selection of candidates is purely on the basis of merit list made which consists of aggregate marks scored by candidates in UG course examinations. You can apply at the respective colleges and then wait for the declaration of final merit list. Kindly check the official sites of the colleges to know the dates of admission opening and seat matrix, Hope it helps.