I would base it more on openings. For an idea how you are with tactics, focus on one opening. Can you perform at the same level with an unfamiliar opening? For me, I am seeing that recently I am not calculating far enough into a position and end up making inferior moves. If I play an opening I am more familiar with, then losing or missing an easier win is usually a result of not seeing tactics.
The difference I am referring to is playing out a position to a desired better position or being able to capitalize on a position without needing to spend a lot of time with each move.
A quick test before you put a game through an engine is to determine how you managed your time. Did you spend 1-2 minutes for each move or were you able to plan several moves and then not need as much time to execute your plan?
This seems to be a good answer as to your progress. If your rating isn't going up but you are winning your games, then perhaps play in specific tournaments instead of relying on a much larger population where others are also improving. You won't see your own advancement as clearly.
How to know whether you are really improving in the game or not?I have been here since 19 December 2014.I have played satisfactorily according to me but how do I know that I am really improving?I play satisfactorily here but during OTB tourneys,I have dropped a lot of points.Here are my ratings on chess.com:-
1636-Standard;Highest-1743
1411-Blitz;Highest-1491
1493(because of timeout)-Correspondence;Highest-1667
Tactics-1896(Highest)
Chess Mentor-1906(Highest)
FIDE rating-1284;Highest-1343(initial rating)
I won't mention the Bullet & Chess960 ratings because I play them when I am bored.I don't take them seriously.So,according to my above ratings,what would be my strength in OTB chess?I play standard games in front of the board so as to get a feel of OTB.Others I play in front of the screen.I don't go to a club because I defeat each and every guy who sits in front of me.I am also the highest rated in our city.So,what will be the best books that I can read just now?