Find weak monsters with high hit points
First of all, you should know that you do not need to focus on hitting each and every monster in the game. In fact, you should try to find monsters that have low defence and offer high hit points. You can train any of your combat by this method, as this will provide you maximum experience, which in turn, will increase your level in the game quickly.
Focus on one skill at a time
Try to focus on one skill at a time. Many players do not follow this method, and keep on increasing their levels in attack, strength, and defence at the same time. The progress slows down, as the experience level is then divided into three parts. Try concentrating on one skill at a time. It is advised that you should first try levelling up your strength. Thereafter, you can focus on increasing your attacking skills and then defence.
Choose right armour for a specific type of training
During the training process, make sure you are using the right type of armour for a specific type of training. This can be very beneficial.
For instance, if you are trying to increase your defence and use an armour that suits for offensive approach, then there is high probability that you will end up gaining little experience.
Magic is considered better than melee, however, it will never work against ranged. Similarly, ranged is better than Magic, but, loses to melee. So, melee becomes better than ranged, but still remains worse than magic. It does not seem logical. However, when applied in different situations, the whole concept becomes logical.