You Can Have Fun in English When You're With Your Fellow Non-Native Speakers

At an intermediate level of English, you can basically survive with about 3000 words. But if you're under stress, or when it's a new situation, then your English might crumble. A jagged profile means that your profile is like ups and downs. You may be very good at reading and writing, but bad in another area. If those things seem familiar to you, then you might be at the intermediate plateau as well.