#include <bits/stdc++.h>
using namespace std;
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T t, V... v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
const long long mod = 1e9 + 7;
const long long N = 4e5 + 5;
const long long INF = 1e18;
void solve() {
  long long n, k, z;
  cin >> n >> k >> z;
  ;
  vector<long long> a(n);
  for (auto &i : a) cin >> i;
  ;
  long long score = a[0];
  vector<long long> dp(n + 1, 0);
  for (long long i = 0; i < n; i++) {
    dp[i + 1] = dp[i] + a[i];
  }
  long long ans = -1e9;
  for (long long i = 1; i < n; i++) {
    score += a[i];
    long long l = z;
    long long r = k - i;
    ;
    long long temp = score;
    while (l > 0 and r > 0) {
      temp += a[i - 1];
      l--;
      r--;
      if (r) {
        temp += a[i];
        r--;
      } else {
        break;
      }
    };
    if (r) {
      temp += (dp[i + r + 1] - dp[i + 1]);
    }
    ans = max(ans, temp);
  }
  cout << ans << "\n";
  ;
}
int32_t main() {
  long long t;
  cin >> t;
  while (t--) {
    solve();
  }
}
