First year paramedic placement

Hello, I would like some advice on how to be successful in placement. I have done my first year placement back in May and I have failed it. The fail was because I was not confident enough to take history with patients. The thing is I am able to do this but not on all patients. If for example there was a patient with chest pain, fall, shortness of breath then I am able to lead in these situations but when it becomes something that I never heard of like some jobs with mental health I just don't know what to ask. I remember it was only my first week out on placement and my mentor put me on a action plan. I realised I was improving and so did my mentor but somehow at the end of it all it just didn't work out. It's not the lack of knowledge that made me unsuccessful it's just not being confident and just overall not very talkative. Its something that I find difficult to overcome. The skills log shows that you have to pass at least 13 of the skills including history taking. Some of the skills that my mentor marked such as blood pressure, peakflow, primary survey were all classed as not met even though I knew how to them. As a result I am doing a short year to retake my placement next year. I am not sure how much a first year student paramedic needs to get involved. I don't know if my mentor wanted a more higher expectation than other paramedics but I want to know what I could do for next year. Clearly reading through textbooks and writing isn't going to help as I have problems with implementing this to real patients. I would be happy if I could get any advice on this thank you.