This Halacha is an excerpt from our Sefer
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Learning Miseches Sota:
It is customary to study Tractate Sota during the period of Sefira. This is an old age Chabad custom and is a directive of the Rebbe Rayatz. One studies one page per day. This is in addition to one’s regular study sessions.
Learning Miseches Shavuos:
Some are accustomed to study Tractate Shavuos during the period of Sefira.
 Hayom Yom 7th Iyar; Sefer Haminhagim p. 43; Toras Menachem 5746 3:253; 5747 3:394; Igros Kodesh 9:76; 18:412; Koveitz Oheiv Sefer 300 year old Kesav Yad; See Chikrei Minhagim 3:80
 The reason: Possibly, the reason is because the Sota would bring an offering of barley, similar to the Omer offering. [Igros Kodesh 18:412] Just as barley contains good and waist, and needs to be refined, so too the Sota needs to be refined of her sin. [Toras Menachem 26:33] This connection is also revealed in the fact that Tractate Sota contains 49 pages, corresponding to the 49 days of the Omer. [Toras Menachem 5746 3:253]
 Igros Kodesh 9:76; 18:412; Toras Menachem 5746 3:253; 5747 3:394
 Likkutei Maharich Seder Yimei Haomer p. 568 in name of Zichron Yehuda that so was custom of Maharam Eish; Chasam Sofer [see Minhagei Chasam Sofer 2:21 and Shut Chasam Sofer E.H. 1:100]; Taamei Haminhagim p. 271 in name of Shirei Mincha; Minchas Omer p. 23