I'm year 11 now. I remember feeling overwhelmed by it all this time last year.
It's important to remember that the run up to GCSEs is a marathon, not a sprint and that gaining those top grades is a journey. Attaining these grades from the very beginning is unlikely and it takes some time to pick up the skills, terminology, vocabulary and awareness of what the examiners want to see. I wouldn't worry.
For me, I am still learning how to write the great essay the examiners are looking for and that with English Literature it can take a long time to finally grasp the right way to phrase and explain things. You are only at the very start. Soon, you will begin to notice improvements in your classwork, which will hopefully be highlighted in your end of year/ mock exams.
If you are finding French hard, it's important to think about which bit is difficult. Are you finding new grammar hard or vocabulary? Speaking, Listening, Reading or Writing? The best way to see your confidence with the language improve is by learning the vocab as once you can understand a large amount of the words, everything seems easier. Looking over grammar that's already been covered that you might not have understood too is important as once you have grasped it and have got good at using it, you should see an improvement in your French.
You have only just started Year 10 and have so many more months ahead of you before you actually sit your exams. For now, do your best in school and try not worry about it all. So long as you try to remain ontopmof it all, the sooner you will realise that it's not as hard as it first seemed.
Hope this helps