My dear one,
I did a lot of checking regarding this matter, and this is the result. If all these things are done well, then it should make a big difference to your success.

1. Gyag Ngen Lhasang puja has to be done a minimum of three times. This is an extensive puja that makes protectors and worldly protectors happy, so that there can be success. It is important to do this puja well.
2. The Diamond Cutter Sutra has to be read by the geshe and lama you know three times each.
3. The Diamond Cutter Sutra needs to be read five times.
4. The 21 Tara Praises need to be recited by Sera Je Monastery.
5. Drugchuma: this needs to be done three times by Kopan Monastery, by the same lama. You can email Kopan to request it.
6. Drugchuma: to be performed three times by Sera Je Monastery.