Ref. No. 1052/41-241
In the name of Allah the most Gracious the most merciful
Then answer to your question is as follows:
The correct method is either to shave the entire head or cut the hair of the whole head evenly. Cutting some hair short and leaving some hair long is a wrong way. Likewise, it is against the Sunnah to shave a portion of the head and leave another portion long. There is a stern warning in the Hadith for those who do so. Clipping all the hair and leaving the front portion long as fashion is also not permissible as it is today’s fashion.
And Allah knows best
Darul Uloom Waqf Deoband