public static void main ( String [ ] args ) {
  Scanner input = new Scanner ( System . in ) ;
  int t = input . nextInt ( ) ;
  for ( int j = 0 ;
  j < t ;
  j ++ ) {
    long x = input . nextLong ( ) ;
    long y = input . nextLong ( ) ;
    int n = input . nextInt ( ) ;
    long [ ] a = new long [ n ] ;
    long [ ] b = new long [ n ] ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      a [ i ] = input . nextLong ( ) ;
    }
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      b [ i ] = input . nextLong ( ) ;
    }
    int i = 0 ;
    long max = 0 ;
    while ( i < n ) {
      long times = ( b [ i ] + x - 1 ) / x ;
      y -= times * a [ i ] ;
      max = Math . max ( max , a [ i ] ) ;
      i ++ ;
    }
    System . out . println ( y + max > 0 ? "YES" : "NO" ) ;
  }
}

public static void main ( String [ ] args ) { Scanner input = new Scanner ( System . in ) ; int t = input . nextInt ( ) ; for ( int j = 0 ; j < t ; j ++ ) { long x = input . nextLong ( ) ; long y = input . nextLong ( ) ; int n = input . nextInt ( ) ; long [ ] a = new long [ n ] ; long [ ] b = new long [ n ] ; for ( int i = 0 ; i < n ; i ++ ) { a [ i ] = input . nextLong ( ) ; } for ( int i = 0 ; i < n ; i ++ ) { b [ i ] = input . nextLong ( ) ; } int i = 0 ; long max = 0 ; while ( i < n ) { long times = ( b [ i ] + x - 1 ) / x ; y -= times * a [ i ] ; max = Math . max ( max , a [ i ] ) ; i ++ ; } System . out . println ( y + max > 0 ? " YES " : " NO " ) ; } }
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