Yog Kriya is a branch of Siddhashram wherein Yog and related kriyas are mastered by disciples under the guidance of their respective Gurus.
Tantra Sadhana is a branch of Siddhashram wherein chosen few disciples are initiated by their Guru into mastering Tantra Siddhis according to their merit & karma.
Vigyan shastra is a major branch which teaches Ancient sciences like Surya Vigyan, Chandra Vigyan, Nakshatra Vigyan, Swar Vigyan, Vayu Vigyan & many more. (As mentioned by Shri Vishuddhanand Paramhamsa)
