received conditional offer 2nd year

Your offer is conditional on you achieving the qualifications as mentioned in our letter. If you meet those conditions, then your offer becomes unconditional. It being a lower ranked university is irrelevant to this.
All universities require some type of qualification in order for you to be admitted unless you are applying as a mature student which means you have work / life experience to bring to the table. If you applied through UCAS you must've have mentioned what qualification you currently have, what are they? are you currently in school? did you apply with grades/quals in hand?

If there is no way that you can meet the offer then you need to contact the Uni and tell them.

what do i say, my start date is on the 13th

“I’m aware that I won’t be able to meet the conditions of my offer, my results will be available on DATE. Can you advise whether I might still be considered?”

i have a chance to appeal but I don't know what to write down.

Are you looking to stay on your current course or go elsewhere? Is the offer a backup?
If you want to stay on your current course, speak to your student union and get a rep to come with you to any appeal meeting.
Read your student handbook and any regs regarding appeals. You can’t appeal just because you disagree with the outcome, you usually need to present info that wasn’t considered the first time around, as well as explain why you hadn’t brought it up before.

i failed the exams for my current course, for that reason they won't put me on for a different course, i don't have any backup offers or there isn't any for me.