You didn't mentioned the council or the subject in/at which you are doing the diploma course. Now in general for Diploma courses each year have 2 semesters and each semester contains 4-5 subjects as well as some practical subjects. Now depending on your council you must have the syllabus available.

To know more about Diploma in Engineering visit the link below:

https://engineering.careers360.com/articles/diploma-in-engineering

Some of the popular Diploma courses are:

• Diploma in Automobile Engineering
• Diploma in Computer Science & Engineering
• Diploma in Electronics and Communication Engineering (DETCE)
• Diploma in Mechanical Engineering (DME)
• Diploma in Aeronautical Engineering
• Diploma in Information Science
• Diploma in Civil Engineering (DCE)
• Diploma in Electrical Engineering (DEE)
• Diploma in Metallurgical Engineering
• Diploma in Electronic Instrumentation & Control Engineering

I hope this answer helps. All the very best for your future endeavors!