My introduction paragraph was about Pharmacy and explaining the role of Pharmacists, and how they are integral to society.
In your second paragraph, you should talk about work experience e.g community, hospital Pharmacy.
In your third paragraph, you can talk about the skills that you learnt during your work experience and how beneficial they were e.g working as a team, ability to multitask, understanding and incorporating patient confidentiality into your work etc.
Next, talk about the qualifications that you are currently undertaking whether it be A Levels, BTEC, Access etc. Talk about individual subjects e.g Biology and Chemistry, maybe mention why you're interested in each and your favorite area e.g Organic Chemistry.
After this, you should talk about yourself. Start with something like 'Studies aside, I am ____' you know? Mention hobbies, sports, if you were a prefect during your secondary education, on the debate team, your first aid qualifications etc.
Your closing paragraph should be relevant to Pharmacy, and about why you think this is the career for you.
There really is no need to mention the GPHC examinations or the training period - you're applying to Pharmacy to enter into first year of the degree.
I did all of the above and have received 2/5 offers for Pharmacy so far!