That's hard to say. I have no idea of where you are endgame-wise, where you're strong and where you're weak, what you already know and what you don't, so I can't really give any specific advice for you.
how do i improve endgame
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First of all, learn this extract from the Endgame Bible (Reuben Fine's Basic Chess Endings) by heart.
The 3 fundamentals of endgame play:
A) Without Pawns on the board, you must be at least a Rook ahead (or 5 points using the P=1, N=3, B=3+, R=5, Q=9 scale) in order to mate your opponent. The only exceptions to this are that the double exchange wins (2 R's vs 2 minor pieces - technically a 4 point advantage) and the fact that a lone Queen cannot defend against 4 minor pieces (technically a 3 point advantage).
B) With a 2 Pawn or more advantage the win is routine. A straightforward advance of the Pawns will net considerable material advantage, usually at least a piece. With the extra piece you capture more Pawns, which will lead to more pieces, which will lead to mate.
C) The largest part of endgame theory deals with taking a 1 Pawn advantage and converting it to a win. The basic idea is that 1 Pawn wins only because it can be used to capture more material. Because of this, the straightforward advance that works so well with a 2+ Pawn advantage doesn't do well here. The main idea to be used is to force an entry with the King while keeping the opponent busy on 2 sides of the board (this is where the power of the outside passed Pawn comes to the fore), then simplifying.
The 15 principles of the endgame:
1) Doubled, isolated and blockaded Pawns are generally weak. Try to avoid them when you can.
2) Passed Pawns should be advanced as rapidly as possible.
3) If you are 1 or 2 Pawns ahead, exchange pieces but not Pawns.
4) If you are 1 or 2 Pawns behind, exchange Pawns but not pieces.
5) If you have an advantage do not leave all the Pawns on one side of the board.
6) If you are 1 Pawn ahead, then in almost every case the game is a draw if the Pawns are on one side of the board.
7) The easiest endings to win are pure Pawn endings.
8) The easiest endings to draw are those with Bishops of opposite colors (one side with a light-squared Bishop, the other side with a dark-squared Bishop).
9) The King is an amazingly strong piece in the endgame. Use it!
10) Do not place your Pawns on the same color as your lone Bishop.
11) Bishops are generally better than Knights in the endgame except in blocked Pawn positions.
12) 2 Bishops vs 1 Bishop + 1 Knight create a tangible advantage in the endgame in almost all cases.
13) Passed Pawns should be blockaded by the King. The only other piece not harmed (or restricted) in watching over a passed Pawn is the Knight.
14) A Rook on the next to the last rank in your opponents territory is more than enough compensation for a Pawn.
15) Rooks belong behind passed Pawns, not in front of them.
Then you can study specific endgames if you wish, maybe from the Bible itself.
How do i improve my endgame??