The Holy Prophet said when the moon of Rajab is sited then recite this dua onceاَللّٰہُمَّ بَارِکْ لَنَا فِیْ رَجَبٍ وَ شَعْبَانَ وَ بَلِّغْنَا رَمَضَانَ ۱

Nafal Namaz: On the first night of Rajab after Namaz-e-Esha offer ten raqat namaz-e- nafal with five salam, in every raqat after surrah Alhumd recite surrah-e kafroon and surrah –e-Ikhlas three times. By the Grace of Allah that person perform this nafal namaz will be included in the list of shaheed and his status will be increased 1000 times.
First Night:  After Namaz-e- Esha offer four raqat namaz with two salam and in each raqat after surrah Fathiha Surrah Alam Nashra once, Surrah Ikhlas, once, Surrah Falak once, Surrah Nas once. When finish first salam then recite Kalma Toheed 33 times and Darood Sharif. Whichever desire he has he should ask Allah and it will be fulfilled.
Every night of Rajab after Namaz-e- Esha offer two raqat namaz. In frist raqat after surrah Fathiha last raqu of Surrah Baqra  “Aman Rasool to Kafareen” recite seven times. Then offer two raqat namaz after surrah Fathiha recite the last ayat of Surrah Hashar “Ho WAllah to Alhakeem (seven times) after that whichever desire he has he should ask Allah and it will be fulfilled.
During this month’s first Friday after Magrib offer twelve raqat namaz with six salams. In every raqat after Surrah Alhumd recite Surrah Alqadir thrice and Surrah Ikhlas twelve times. After that recite seventy timesاَللّٰہُمَّ صَلِّ عَلٰی مُحَمَّدِ نِ النَّبِیْ الامُیِّ وَ عَلٰٓی ٰالِہٖ وَسَلَّمْ

Then go into Sajdah and recite seventy times سُبُّحٌ قُدُّوْسٌ رَبُّ المَلٓائِکَۃِ وَالرُّوْحِ    then get up and recite seventy times رَبِّ اغْفِرْ وَارْحَمْ تَجَاوَزُ عَنَّا نَعْلَمُ اِنَّکَ اَنْتَ الْعَزِیْزُ الْاَعْظَمْ then go into Sajdah and whichever desire he has he should ask Allah and it will be fulfilled.
Any night of Rajab offer twelve raqat namaz with three salams, in first two raqat after Surrah Fathaiha recite Surrah AlQadar in every raqat three times each and after salam, seventy times sitting on the same place recite this لَآ اِلٰہَ اِلاَّ اللّٰہُ الْمَلِکُ الْحَقُّ الْمُبِیْنُ in other four raqats after Surrah Fathiha , Surrah Al Nasr three times each seventy times sitting on the same place recite thisاِنَّکَ قَوِیُّ مُّعِیْنٌ وَّاحِدِیٌّ دَلِیْلٌ بِحَقِّ اِیَّاکَ نَعْبُدُ وَاِیَّاکَ نَسْتَعِیْنُ۔ وَسَتَّارُ الْعُیُوْبِ وَاَتُوْبُ اِلَیْہِ In fourth and raqat raqat after Surrah Fathaiha recite Surrah Ikhlas three times each and seventy times sitting on the same place recite Surrah Alam Nashra then pray to Allah InshAllah all your desires will be full filled.
On the fifteen of Al Rajab after any of the namaz recites Istagfar it’s very great and one who recites it his all bad doings are forgiven and Allah changes it into to good deeds.  اَسْتَغْفِرُ اللّٰہَ الَّذِیْ لَآاِلٰہَ اِلاَّ ہُوَ الْحَیُّ الْقَیُّوْمُ غَفَّارُ الذُّنُوْبِ
Any day/date of Rajab after namaz-e- Zohar or Maghrib or Esha recite Surrah, Kahaf, Surrah Yaseen, Surrah Ha Mem, Surrah Dakhan, Surrah Mararig,  (one time each) then recite Surrah –e- Ikhlas one thousand times Allah will shower His blessings on the person who does that.