#include <bits/stdc++.h>
#pragma GCC optimize(2)
#define all(n) (n).begin(), (n).end()
#define se second
#define fi first
#define pb push_back
#define mp make_pair
#define sqr(n) ((n)*(n))
#define rep(i, a, b) for (int i = (a); i <= (b); ++i)
#define per(i, a, b) for (int i = (a); i >= (b); --i)
#define precision(a) setiosflags(ios::fixed) << setprecision(a)
#define IOS ios::sync_with_stdio(false);cin.tie(0);cout.tie(0)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> PII;
typedef pair<ll, ll> PLL;
typedef vector<int> VI;
typedef vector<long long> VL;
typedef double db;

template <typename T> inline char read(T &x) {
    x = 0; T fg = 1; char ch = getchar();
    while (!isdigit(ch)) {if (ch == '-') fg = -1;ch = getchar();}
    while (isdigit(ch)) x = (x << 3) + (x << 1) + (ch ^ '0'), ch = getchar();
    x = fg * x; return ch;
}
template <typename T, typename... Args> inline void read(T &x, Args &... args) { read(x), read(args...); }
template <typename T> inline void write(T x) {
    int len = 0; char c[21]; if (x < 0) putchar('-'), x = -x;
    do{++len; c[len] = x%10 + '0';} while (x /= 10);
    for (int i = len; i >= 1; i--) putchar(c[i]);
}
template <typename T, typename... Args> inline void write(T& x, Args &... args) { write(x), write(args...); }

template<class T1, class T2> bool umin(T1& a, T2 b) { return a > b ? (a = b, true) : false; }
template<class T1, class T2> bool umax(T1& a, T2 b) { return a < b ? (a = b, true) : false; }
template<class T> void clear(T& a) { T().swap(a); }

const int N = 1e5 + 5;

int n, m, _, k, cas;
PII a[N];

int main() {
    IOS;
    for (cin >> _; _; --_) {
        ll A, B; cin >> A >> B >> n; bool f = 1;
        rep (i, 1, n) cin >> a[i].fi;
        rep (i, 1, n) cin >> a[i].se;
        sort(a + 1, a + 1 + n);
        rep (i, 1, n)
            if (B > 0) {
                int x = (B - 1) / a[i].fi + 1, y = (a[i].se - 1) / A + 1;
                if (x < y) B = -1, f = 0;
                else B -= y * a[i].fi;
            }
            else f = 0;
        cout << (f ? "YES\n" : "NO\n");
    }
    return 0;
}