If they still do it the same way they did when I started GCSE French a couple of years ago, you'll do a couple of speaking tests at the start of year 10, and they'll mostly base your predicted grades off of that. But 6s are good grades, so maybe you'll be predicted a B or an A, if they don't test you. My friend (who admittedly has worked very hard for it over the last few months of the GCSE course) was at your level at the end of year 9, and she's now expecting to get an A*. You start French again from the beginning at GCSE, so it's really all down to the effort you put in and some level of natural talent for understanding how languages work.
In terms of tips, just going over what you've learned for ten minutes the night after each lesson, listening to the odd French song/subtitled film, and really learning all your material for the writing and speaking exams will do wonders. When you're trying to learn the pieces, knowing what each phrase means and breaking it down into chunks (learning a few lines each night, then putting it all together) is the best method my friend and I have come up with. The best you can do for listening is not panic, listen out for key words, and move onto the next question if you miss something, filling in any blanks when the section is repeated. If that all fails, take an intelligent guess and you might just get the mark anyway.