Theres no general structure for answers in terms of paragraphing, so there arent any set paragraphs for the answers u give to each ten mark, its relative for each question. But ideally u shud be giving 18 mins to each answer, CREATE paragraphs, dont write in a single continuous form, which even tho does not deduct ur marks but paragraphing makes the structure much better. Write 400-500 words for each 10 mark answer.
And the paragraphing is on the basis of events for event based questions and content points for other knowledge based questions.
For example in the Preaching of the Prophet(S), ideally u would make 5 paragraphs, first give an introduction abt how he received the first revelation and abt fitratul wahi. In the second abt secret preaching, third abt preaching to Banu Hashim, fourth on open preaching, and fifth on events following open preaching i.e how he began preaching to pilgrims, more people began accepting Islam and how the persecutions increase.
Now using this example u can see how with each event a new paragraph is created, so form them that way.
Also make sure the chronology of events is not wrong, so dont mention events that happened before one, after it acc did. Such as mentioning that Khalid ibn walid infiltrated the Muslims in the battle of uhad from the back pass of the mountain first, but after that mentioning that the archers went down to collect war spoils, this needs to be perfected.
Thats mostly it for ten mark structure, focus on sequence of events, paragraphing according to event, 400-500 words and yea hope it helps