All this week, Newsround has been looking into things that you've told us you worry about, and today it's doing well at school.
Some people think there's too much pressure on kids to do well these days - all those tests, exams and SATs.
And not everyone can be top of the class!
What do you think? Do you feel under pressure to do well? Are you worried that you're not clever enough?
Perhaps you struggle to keep up or have a problem like dyslexia, which means you find it harder than other people to learn in school?
Or maybe you never worry about school? If that's the case, what tips can you give others?
Whatever your views, email us and share your thoughts.
Unfortunately this topic is now closed but there are Comments pages on other subjects on the main Chat index.
"I don't worry about school, but I understand if people do because there are bullies in schools. I feel really sorry for people if they are worried about school."
Alice, 11, Essex, England
"I worry about school at the moment because SATs are coming up and I am getting really stressed. I can't sleep. I need some stress tips badly!"
Sarah, 11, Essex, England
"There are a lot of good things about school, but forgetting your homework is a problem!"
Kirsty, 12, London, England
"School is cool because I get to see my mates - lessons are dull!"
Kathryn, 13, Wiltshire, England
"No, I don't. I like school, learning new things and stuff."
Isabelle, 10, New Malden, England
"Nobody should worry about school. I don't."
Matthew, 8, Willington, England
"We get too much homework! And I often stay up till 1am to finish it and almost fall asleep at school! It's really hard to finish projects because they give us too many to do at once! And you often have to worry about keeping good grades!"
Natsumi, 12, London, England
"I don't need to worry, even though I have my SATs in two weeks time. I'll just try my best and hope for the best."
Jessannie, 11, Essex, England
"Yes, definitely! I worry mostly about my grades. I am in advanced classes and sometimes it's really hard to keep up. Sometimes I have three tests in one day!"
Katie, 14, New York, America
"Every school year we have assessment in autumn, English and maths progress tests in spring and main exams in the summer. Lots of my friends get very uptight, but I'm fine!"
Meg, 11, Bury St Edmunds, England
"In my class, there are loads of younger ones so it's like they get more attention and it worries me because I've got SATs coming up soon."
Elish, 9, Halifax, England
"It's just over a week for SATs and pressure is piling up. If I want to stay at the top I have to get the level 5. :("
Alana, 11, Manchester, England
"Recorder practice worries me. The teacher expects me to play on my own, but I'm useless."
James, 9, Garmouth, Scotland
"I worry about homework."
Billy, 6, Hull, England
"I don't worry about tests, but that is because I am bright. But I do worry about moving up to secondary school because my best friend is going to a different one!"
Claire, 11, Sheffield, England
"Like the boy in your Why Worry? programme, I was taken out of school, but at 13. I have autism, which makes it very hard for me to cope with other people and I struggle with language. This meant I got severely bullied at secondary school. I'm just glad I'm out of there now. I do up to degree-level in art and maths, but year 7 English language. I don't have to do exams now I'm in home education, but I think more should be done about autism in mainstream schools, especially secondary schools!"
Kaytee, 15, Devon
"We have a lot of tests, but I don't really feel under pressure. It's a part of school, and is what we should expect."
Abigail, 12, London, England
"Worry? Of course I worry! My SATs are next week and I'm worrying my hair off! I can't stop revising because I want to do really well. Revising stops me worrying and I'll know I did my best."
Sara, 14, Hertfordshire, England
"I don't worry about school, but I think it is very important. It dictates what sort of a job you get in the future."
Abi, 11, Wakefield, England
"I get worried in my French class because I really can't do French! Our teacher goes so fast and I can't remember anything! It's so embarrassing when she asks me something in front of everyone and I just sit there and go bright red."
Olivia, 12, Surrey, England
"I worry at school because sometimes I don't get the results of a test and I get worried if I've done well or not."
Grace, 11, Reading, England
"There is no need to worry about SATs as they are only there to help you. The mark isn't important. SATs are just there so your secondary school can identify your strong and weak points."
Beth, 13, Harborough, England
"I don't worry about school. In end- of-year exams I always do fine."
Lauren, 10, Penarth, Wales
"I worry about school because I'm scared of not getting good marks on my SATs, which will mean I won't get a good job when I'm older."
Brogan, 10, Manchester, England
"I think it's going to be hard if you're not that wise in school."
Chloe, 11, Glasgow, Scotland
"I worry about school because next year is when I start to do standard grade, which is worrying me because I'll have to work a lot and if I'm off I'll be behind in work. Then there's exams, which is making me more worried."
Heather, 13, Glasgow, Scotland
"I get really annoyed about exams."
Yikanzi, 11, Tokyo, Japan
"I worry at school when my work is wrong, because people copy me."
Deborah, 6, Essex, England
"Yes, I hate all the exams in school. They make me really stressed and it's not fair!"
Beth, 14, St Helens, England
"I think SATs are only necessary for year 6, not year 9 when the next year you've got GCSEs. It's plain stupidity."
"Yeah I worry about school because next year is when I start to do standard grade. Which is worrying me cause I'll have to work a lot and if I'm off, I'll be behind in work. And then there's exams which is making me more worried."
Heather, 13, Glasgow, Scotland
"Ever since I have moved to the US I have found school easier, but back when I lived in England I found school very hard and the teachers always put pressure on us about our SATs and gave us extra homework when we were close to our SATs."
Danielle, 13, Miami, USA
"I like one thing about school. Seeing my mates. Everything else is rubbish. I don't really care about SATs that I'm taking in two weeks, it's GCSEs that I worry about."
Tanya, 11, Lancashire, England
"Yes I do worry about school, especially in exams. We have a test coming up in about three weeks and it's really stressing me out!"
Chloe, 11, Rhyl, Wales
"I worry about school a lot, especially tests. We get lots of tests and it is putting too much pressure on me and my class mates. I am worried that I am not smart enough. My class mates are always getting higher marks than me!"
Kate, 12, London, England
"I think the tests are alright, but sometimes they are hard because we do tests in other classes as well so we can have four in a day!"
Abaidur, 12, Hampshire, England
"I worry about exams even when I revise everything, but when you actually do them they are not that bad."
Hrachik, 11, Hertfordshire, England
"Yes, I am worried about school. I do struggle at learning when I think something is hard. I think that my mum will be disappointed in me if I get a low score in a test like the SATs."
Katie, 10, Manchester, England
"I don't really worry about school because I usually come top even in Irish, even though I only moved to Ireland 4 years ago!"
Aisling, 10, Galway, Republic of Ireland
"I am not worried about school so I am fine."
Angharad, 10, Dorchester, England
"I worry a bit, but not much. If I was really worrying about school, I would try to get more help."
Kathryn, 11, Hebrides, Scotland
"I don't feel pressurised at all! I just try my best."
Tracy, 12, Leicester, England
"At my old school, every day we did a test and it got lots of kids really stressed!"
Olivia, 11, Bury, England
"I worry about tests, this week we had a test - it is really worrying whether you have done good or not!"
Megan, 10, Macclesfield, England