甲、乙两班中的学生按学制不同又分为本科生和研修生，本科生学制两年半，研修生学制灵活，随到随学，也随时可以走。不过杨昊是七年来唯一一个通过文武双试的研修生，在此之前全科甲等班里只有本科生，
杨昊所在的班里只有十二个人，同窗中年纪最大的名叫赵普，二十八岁，是四个孩子的爹了，入学前已是淮南镇从四品统军将军。
比杨昊小的只有两个人，一个叫阳山，户部侍郎阳呈雍之子，另一个名叫羊弘扬，父亲生前为陇州教谕，吐蕃犯边，其父组织民团抵抗，被俘殉职。羊弘扬年幼时家境贫寒，全靠母亲与人缝补浆洗衣裳赚取米粮钱，后得朔方节度使王希廉赏识，留在牙署为文吏，又见他精明干练，遂举荐其入刺马院深造。
杨昊第一天上课堂，阳山便来问他：“你闯了什么祸被配到这来受罪？”阳山长着一张圆乎乎、粉嫩嫩的娃娃脸，表情憨憨的，杨昊跟他一见投缘，如实回答：“我在大明宫里打了余驸马，圣上贬我到边疆，兵部安排我来这走个过场。”阳山挑起大拇指赞道：“你真行。”
杨昊反问他：“那你呢？你怎么跑这来了？”
“我把小娘给气走了。”阳山眨眨眼睛，憨憨地笑道，“小娘在背后咒我娘，我就趁她睡着了，倒了一碗辣油在她茶碗里，然后在她嘴唇上抹上些芥末，她辣醒了，心一急，端起茶碗喝茶，结果是喝了一大口辣油……”
杨昊被逗的哈哈大笑，心里却在想：“小小年纪就满肚子心机，长大了还得了，但愿他别走到歪路上去！”杨昊又问阳山：“你这么聪明，该到太学、国子监去，为何来刺马院？当兵可是要戍边上战场的，你不怕吗？”
阳山拍着胸脯慷慨说道：“大丈夫在世当立功名传万代，学大汉霍去病，学本朝李（靖）大将军！读那些劳什子书有个屁用。”说完，他问杨昊：“你的志向是什么？”
杨昊想了想答道：“学成真本事，为国尽忠，博取一世功名。”阳山眼珠子一轮，拍案叫道：“那咱们是志同道合呀！咱们拜把子结兄弟怎样？以后你就是我大哥了。”杨昊起初还有些嫌他心机太深，但刚才那番话却让他改变了对阳山的看法，于是便答应下来。阳山大喜朝着羊弘扬喊：“那个姓羊的，你也过来拜把子。”
羊弘扬正埋头看书，闻言，怪声怪气地答道：“跟我这样的人结拜，岂不降了你们的身份。”杨昊听他说话古怪，面露不悦之色。阳山大咧咧地笑道：“他就是这副臭脾气，刀子嘴，豆腐心。”说着，阳山推开课桌冲到羊弘扬面前，扯着他便往门外拉。
眼见庭院中有一株桃树，杨昊便提议道：“咱们今日就效法刘关张桃仔细园三结义的故事，拜为异姓兄弟，富贵同享，祸难同当。”阳山和羊弘扬知道刘备、关羽、张飞是结义大郎弟，却不知道桃园三结义这个桥段，但听杨昊说的慷慨，心中也喜欢。
阳山跑回去拿了供奉神位的香炉，摆在桃树下，三人并肩跪下来，盟誓，结兄弟。赵普等人都到廊檐下观看。三人盟誓已毕，一叙年龄，杨昊年纪最大，羊弘扬次之，阳山最小。三人虽性格迥异、身世不同，但脾气相投，又都是少年心性，不过几天就熟悉的跟亲兄弟一样。
同窗见状便戏称三人为“三只羊”。
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