#include<bits/stdc++.h>
#define ll long long
#define ld long double
#define db double
#define pint pair<int,int>
#define mk make_pair
#define pb push_back
#define eb emplace_back
#define ins insert
#define fi first
#define se second
#define For(x, y, z) for(int x = (y); x <= (z); x++)
#define Rep(x, y, z) for(int x = (y); x >= (z); x--)
using namespace std;
const int MAXN = 1.5e5 + 5;
char buf[1 << 12], *pp1 = buf, *pp2 = buf, nc;
inline char gc() {
    return (pp1 == pp2) && (pp2 = (pp1 = buf) + fread(buf, 1, 1 << 12, stdin), pp1 == pp2) ? EOF : *pp1++;
}
inline int read() {
    int x = 0, ny = 1;
    for(; nc = gc(), (nc < 48 || nc > 57) && nc != EOF; ) 
        if(nc == '-') ny = -1;
    if(nc < 0) return nc;
    x = nc ^ 48;
    for(; nc = gc(), (nc >= 48 && nc <= 57 && nc != EOF); )
        x = (x << 3) + (x << 1) + (nc ^ 48);
    return x * ny;
}
int n, m, p[MAXN << 1], rt[MAXN], id[MAXN], cnt, tot = 0;
pint seg[MAXN];
vector<int> G[MAXN * 30];
int dfn[MAXN * 30], low[MAXN * 30], vis[MAXN * 30], stk[MAXN * 30], top, bel[MAXN * 30], N;
void dfs(int x) {
    dfn[x] = low[x] = ++dfn[0], vis[x] = 1, stk[++top] = x;
    for(auto y : G[x]) {
        if(!dfn[y]) {
            dfs(y), low[x] = min(low[x], low[y]);
        } else if(vis[y]) low[x] = min(low[x], dfn[y]);
    }
    if(dfn[x] == low[x]) {
        ++N;
        for(int u = 0; u != x; ) u = stk[top--], vis[u] = 0, bel[u] = N;
    }
}
inline void addEdge(int x, int y) {
    if(!x || !y) return ;
    G[x].push_back(y);
}
int ls[MAXN * 30], rs[MAXN * 30];
inline void addEdge(int x, int l, int r, int ql, int qr, int s) {
    if(!x) return ;
    if(ql <= l && r <= qr) {
        addEdge(s, x);
        return ;
    }
    int mid = l + r >> 1;
    if(qr <= mid) addEdge(ls[x], l, mid, ql, qr, s);
    else if(ql > mid) addEdge(rs[x], mid + 1, r, ql, qr, s);
    else addEdge(ls[x], l, mid, ql, qr, s), addEdge(rs[x], mid + 1, r, ql, qr, s);
}
inline void ins(int &x, int l, int r, int pos, int t) {
    int tt = x;
    x = ++tot, ls[x] = rs[tt], rs[x] = ls[tt], G[x].clear(), addEdge(x, tt);
    if(l == r) {
        addEdge(x, t);
        return ;
    }
    int mid = l + r >> 1;
    if(pos <= mid) {
        ins(ls[x], l, mid, pos, t);
        addEdge(x, ls[x]);
    } else {
        ins(rs[x], mid + 1, r, pos, t);
        addEdge(x, rs[x]);
    }
}
inline void Solve() {
    n = read(), m = read(), cnt = 0;
    For(i, 1, n) {
        p[++cnt] = seg[i].fi = read();
        p[++cnt] = seg[i].se = read();
    }
    sort(p + 1, p + cnt + 1), cnt = unique(p + 1, p + cnt + 1) - p - 1;
    For(i, 1, n) {
        id[i] = i;
        seg[i].fi = lower_bound(p + 1, p + cnt + 1, seg[i].fi) - p;
        seg[i].se = lower_bound(p + 1, p + cnt + 1, seg[i].se) - p;
    }
    sort(id + 1, id + n + 1, [] (int a, int b) {return seg[a] <= seg[b];});
    For(i, 1, 2 * n) G[i].clear();
    tot = 2 * n, rt[0] = 0;
    For(i, 1, n) {
        int l = seg[id[i]].fi, r = seg[id[i]].se;
        addEdge(rt[i - 1], 1, cnt, l, cnt, id[i]);
        rt[i] = rt[i - 1], ins(rt[i], 1, cnt, r, id[i] + n);
    }
    rt[n + 1] = 0;
    Rep(i, n, 1) {
        int l = seg[id[i]].fi, r = seg[id[i]].se;
        addEdge(rt[i + 1], 1, cnt, 1, r, id[i]);
        rt[i] = rt[i + 1], ins(rt[i], 1, cnt, l, id[i] + n);
    }
    For(i, 1, m) {
        int a = read(), b = read();
        addEdge(a + n, b), addEdge(b + n, a);
    }
    For(i, 1, tot) dfn[i] = low[i] = vis[i] = 0;
    top = dfn[0] = 0, N = 0;
    For(i, 1, tot) if(!dfn[i]) dfs(i);
    For(i, 1, n) if(bel[i] == bel[i + n]) {
        puts("NO");
        return;
    }
    puts("YES");
}
int main() {
    // freopen("C.in", "r", stdin);
    // freopen(".out", "w", stdout);
    for(int t = read(); t--; ) 
        Solve();    
    // cerr << sizeof(G) / 1024. /1024. << '\n';
    return 0;
}