I am following English premier League and Australia A league. 80-85% matches 1st half Happen corner over 3.5 that's odds 1.32-1.40 . So anyone wants to safe betting then you can bet there. Not all matches. Select for a team like Manchester United. If Manchester United and it's partner fail to cover 3.5 corner in 1st half in a match then the next match stake high between Manchester United Vs opponent team. That's the simple tricks. This tips dose not work for 100%, so bet your own risk.
I'm not a fan of european football. I don't follow the sport or watch games.
Here are some ideas for accurately predicting points over / unders based on observations of other sports.
1. Some teams start quickly and score more points in the 1st half than the 2nd half. Other teams are the opposite, slow starters. Some teams have good cardio and endurance, while others are explosive but lack the endurance to play well in the 2nd half. Observations can be drawn based on team performance, which can increase accuracy.
2. In the mid to late season, teams that are in the running for playoffs will usually be more competitive and score more points than teams that are out of contention for playoffs. Factors such as these can help to generalize how motivated teams are to show up, score points and win games.
3. Team rivalries. There are rivalries which lead to some teams trying much harder to win the game, than they would if they played a team they didn't care about. Team rivalries are sometimes a good environment for calling points over.
Long story short, there are many indicators and observations which can be drawn from sports which remain somewhat consistent over time.
Part of being a successful gambler is observing games and finding patterns and a formula for making predictions that have good accuracy. IMO anyway.