I wouldn't worry too much if I were you. It's still early days, especially if you're in year ten. There are many people who have been able to turn the tables round in just a few months with dedicated hard work, close to exam time...
As long as you keep on top of your class notes, revision and work hard you should be able to improve and your grades should rise throughout the year. Print out the specifications for each subject and pick out what you're weak at, and ask your teacher how you can improve your grades. You could also watch you tube channels (There are so many out there, dedicated to different subjects). Don't panic yet! That's what I advise anyway. Hope that helps.