Here is why we object to pre testing. According to videos on drawing procedures we have seen for different states, most of them do 4 tests before the official draw and 4 tests after the official draw. (Now this may vary depending on the state, but we'll go with 4 & 4.) So if you have an official draw, there will be 8 tests before the next official draw. 4 tests after the last official draw, and 4 tests before the next official draw. Agreed?
Now, I will assume you keep detailed records of each drawing and track various things related to your particular lottery game. You have charts for every drawing for every day of the year, am I right? You track what hits, what doesn't, how often something does or doesn't happen, the hits and skips for each item you track, singles, doubles, pairs, sums, repeats, etc, etc.
Now, lets go back to the beginning of the year. Jan 1. This is an official draw. The next official draws are Jan 10, 19, 28, Feb 6, 15, 24, Mar 4, 13, 22, 31. Apr 9, 18, 27, May 6, 15, 24, June 2, 11, 20, 29, July 8, 17, 26, Aug 4, 13, 22, 31, Sept 9, 18, 27, Oct 6, 15, 24, Nov 2, 11, 20, 29, Dec 8, 17, 26.
Now lets say all the dates between the official draws are post tests and pre tests that happen before the next official drawing. But you have no idea whatsoever what these drawing results are because none of the states (except Texas) tell you. Now what is that going to do to your tracking methods?
Now before you say, I don't know what they are anyway so it doesn't matter, consider this. They still happened. If you did know what they were would that affect your charts? You bet they would. If you know the result on Jan 1 and don't know what happened on the 2 to the 9, would that matter as to what you played on the 10th? Sure would. If you DID know all the results from Jan 1 through the 9th, would that cause you to play something different on the 10th than if did not know the results? I think it would.
A number, or pair, or anything, can go hot or cold in the tests but you don't know that. Maybe you thought doubles were due, but there were 6 out of 8 in the tests, but you don't know that. So when you played them every day for the next week, because you knew they were due, and HAD to hit, and they don't show because they went cold after the hot streak on the tests, you lost your money. You see what I mean?
Now you tell me. If there were no test draws at all to alter or change trends, patterns or streaks, and the only drawings were the actual drawings, do you think it would be any easier to make accurate predictions?