What is Ashtakavarga predictions

Ashtakavarga is a very sophisticated and unique transit system. There is nothing else like it anywhere in the world. In Vedic Astrology, there is such a plethora of techniques to choose from. According to Parasara, to make the process of prediction a lot simpler, Ashtakavarga can be used. To practice Ashtakavarga effectively, it is important to be very familiar with the qualities and actions of each planet as a karaka and the qualities and actions of each house. This is the key.
The principle seven planets viz the Sun,Moon,Mars,Mercury,Jupiter,Venus ,Saturn
and the Ascendant are used as reference points and each of them scores between 0-8
depending on how auspiciously or inauspiciously they are placed from each other. This system is called Ashtakavarga ; Ashta (eight) and Varga (division) and
was first taught by Lord Shiva to Parvati in the Bramhayamala tantra.

You may have seen several Ashtakavarga charts. Usually there is one for every planet. The chief amongst them is called the Sarva-ashtakavarga and is always the biggest chart when compared to the other Ashtakavarga charts. Sarva means all-encompassing and this chart is a sum total of all other ashtakavarga chart.
Rahu and Ketu do not have separate Ashtakavarga charts as they are shadow planets. So you will have 7 plus 1 and that makes it 8.Most people have no idea that it is one of the very useful information available in their horoscope.
Ashtakavarga is more important than Gochara. It is a more precise measurement because it measures a planet’s strength from every planet, not just the Moon. Gochara is just 1/8 of Ashtakavarga. If a planet is transiting a house with high points in Ashtakavarga, but a bad house from the Moon (Gochara), then the results of Ashtakavargatrump the results obtained from Gochara. For example, Saturn transiting the 12th, 1st and 2nd from the Moon is considered inauspicious, but Saturn may be very auspicious in other respects, as in the case of Saturn transiting a house with high Ashtakavaraga points. In this case, Saturn would be able to perform very well and give auspicious results. Ashtakavarga takes a more accurate and holistic look at the transiting planets than just those transits from the natal Moon.

Thus, each of the seven planets earns certain points, which is again unique for each person
and enables one to know how favourable a particular planet or an area of like of for them.

0, 1, 2, or 3 points = Bad; 4 points =Average; 5, 6, 7, or 8 points = Good

Scores of 0 are considered most inauspicious, whilst from 1-3 are regarded as inferior.
A score of 4 makes a planet neutral and such does not cause any harm but neither does it
bestow any gains. Scores from 5-8 are considered lucky and fortunate with the strength
increasing as they plummet towards 8. Should a planet score 8, is signifies gains of
kingdom and royal insignia.

Points earned by every sign from different planets are than added to get sarva-ashtakavarga. In sarva-ashtakavarga overall strength of houses getting from every planets are judged. Here 25-27 points are considered neutral, below 25 is inauspicious and above 30 is highly auspicious.
Planets placed in house where points are above 30 will work beneficially even its malefic in its placements.