#define EPS 1e-9

struct Line {
    int y,x1,x2;
    Line(){}
    Line(int a, int b, int c) : y(a), x1(b), x2(c) {}
    bool operator < (const Line &a) const {
        return y < a.y;
    }
} L[5005];

int T,n,W;

double calc(double x1, double y1, double x2, double y2) {
    double A = y1 - y2;
    double B = x2 - x1;
    double C = -(A*x1+B*y1);
    return -C / A;
}

int main() {
#ifdef LOCAL
    freopen("in.txt","r",stdin);
#endif
    scanf("%d",&T);
    while(T--) {
        scanf("%d%d",&W,&n);
        for(int i=0;i<n;++i) {
            int y,x1,x2; scanf("%d%d%d",&y,&x1,&x2);
            L[i] = Line(y,x1,x2);
        } sort(L, L + n);

        double s = 0, e = W;
        for(int i=0;i<n;++i) for(int j=i+1;j<n;++j) {
            s = max(s,calc(L[i].x1,L[i].y,L[j].x2,L[j].y));
            e = min(e,calc(L[i].x2,L[i].y,L[j].x1,L[j].y));
            if(s - EPS> e) break;
        }
        if(s - EPS > e) cout<<"NO"<<endl;
        else cout<<"YES"<<endl;
    }
}