Is it more important to keep your old friends than it is to make new friends?

*This is a TOEFL writing practice. Please help me correct my article. Thanks for helping me!! *
**The topic is: Do you agree or disagree with the following statement? It is more important to keep your old friends than it is to make new friends. **

I agree with the statement that it is more important to keep your old friends than (it is) to make new friends for the following reasons. First of all, you would have some memories with your old friends. You guysall*1 always can talk about things you have been through in the past. For example, when I was in high school, some of my friends hided my chair and table in the classroom in order to fool me on the fool's day. As I walked into the classroom, I was(/got) very nervous about it when I found my table and chair were not in their (right) position. In the end, I found them in other classroom. I was angry but felt funny at the same time. Even now*2, I would still talk about those silly things with my old friends.

Secondly, you don't have to be careful with your old friends because you are very familiar with them. You know what they like and what they don't like. So you would feel more comfortable with your old friends than with new friends. For instance, a friend of mine doesn't like people say something behind someone's*3 back. Then we would never gossip others when we are with her. But for(/with) my other friends, we just(/still) need some gossiping time for fun.

Finally, you can trust your old friends more than your new friends. Because you have been through many things with your old friends, you can trust them. Sometimes, we would need other's' helps(/another's help/another person's help). AtIn this point*4, you would always ask your old friends (for) a favor, instead of your new friends. And of course, your old friends would always love to help you.
Thus, I think to keep your old friends is more important to make new friends.

Hello Chaire, read this notebook. It is easy to understand each part and the whole story. And attractive enough. I didn't find much problems there.

These are the points I noticed. Hope you could sort out what you need. Thank you!

*1 It is better to use polite word in the writing like this.

*2 The separated use of "now" is often took as an interjection. It is better to use "Even now" or so here.

*3 It(the gosship) is usually done for a single person. 

*4 Please note that "At this point" usually indicates time or place.

I agree with the statement that it is more important to keep your old friends than it is to make new friends for the following reasons. First of all, you would have some memories with your old friends. You guys always can talk about things you have been through in the past. For example, when I was in high school, some of my friends hided my chair and table in the classroom in order to fool me on the fool's day [April Fools' Day?]. As I walked into the classroom, I was very nervous about it when I found that my table and chair were not in their original/normal/usual position place. In the end, I found them in another classroom. I was angry but felt funny at the same time. Now, I would still talk about those silly things with my old friends. 

Secondly, you don't have to be careful with your old friends because you are very familiar with them. You know what they like and what they don't like. So you would feel more comfortable with your old friends than with new friends. For instance, a friend of mine doesn't like it when people say something behind others' backs. Then we would never gossip about others when we are with her. But for with my other friends, we just need some gossiping time for fun.

Finally, you can trust your old friends more than your new friends. Because you have been through many things with your old friends, you can trust them. Sometimes, we would need other's help. At this point, you would always ask your old friends for a favor, instead of your new friends. And of course, your old friends would always love to help you.
Thus, I think to keeping your old friends is more important to than making new friends.