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从摸底到兜底,把一轮复习后半程走实

  • 2026-11-11 07:14:09
从摸底到兜底,把一轮复习后半程走实

从摸底到兜底,把一轮复习后半程走实

——在高三全体教师会暨一轮复习推进会上的讲话

同志们,一轮复习走到今天,已经过半。前面这几个月,教材过了一遍,课讲了一遍,卷子考了一遍,学生的知识底子、方法习惯究竟长成什么样,到今天我们心里只有一本糊涂账。接下来这段路是一轮复习最吃劲的时候,也是层次拉开的时候。考场上最后丢的那几十分,多半不是被难题拿走的,而是被我们自己没摸清、没补上的漏洞拿走。今天这个会只讲一条主线:先把底摸清,再把底见实,最后把底兜住,后半程一寸一寸走实。

这条主线落到今天是四步:摸底、见底、兜底、走实,四个词分量不同,少一个,后半程就撑不住。散会时我希望每位老师带走三样东西:一张本班的知识漏洞清单,一张后半程的复习路线图,一份自己学科的限时训练安排表。三样东西下周都要有第一版,年级组逐个验收。

一、摸底:三个底数,一个都不能少

(一)“知”底要清,知识漏洞摸清

摸底第一件事是把底数摸清。请把三样东西合起来看:教材、考纲和这一阶段的错题本。本周之内,按考纲条目把本学科知识点拉一张清单,对着教材一节一节勾。讲过的打一个记号,讲过而反复做错的画个圈,没正讲过、考试却考到的画个重点号。记号一打,缺口在哪儿看一眼就明白。

清单不能只躺在纸上,要落到人。每位老师添一张表,把圈和重点号落到人:哪几位同学在哪些知识点上出错、几次都栽在同一处的,就是要补的对象。表不求全,中下游三十位逐人标一标就够。画出来教研组碰一次,共性的进集体备课,个别的一对一面批。摸底摸到人身上,才算真摸到底。

(二)“知”底要准,能力短板摸准

底数清了还要摸准。关键看能不能把知识没记牢和能力没长出来分开。怎么分?做一次对照性的限时训练:选一份中等难度的卷子,同一时段、同样题量、同样时长,把讲过的内容和本阶段新讲、没讲透的内容分别标上记号,统计两类得分率。同样的时间同样的题量,差别就出来了,不能靠印象拍。

得分率低,还要往里归一层:是知识点记不牢,还是方法链断在中间。教研组挑一道典型错题,比如要三步推导的综合题,全班得分率不到两成,同考点的单步小题得分率却很高,问题出在方法链断了,不是知识没记牢。归因写成一张表,一栏现象,一栏原因,一栏动作,归因不到位,讲评时不算讲完。

(三)“知”底要实,队伍状态摸实

第三个底数是队伍状态,最容易被忽略,其实最要紧。一轮复习拼的不是谁的资料多,而是谁的课备得扎实、改批及时、跟同事搭得上。教研组里,有的老师家里有事,有的在带徒弟,有的改卷改到深夜。这些是实情,我不批评,关心的是队伍能不能保持住节奏。要求很简单:先要有底,心里有数,手上有活。

怎么落到实处?三个实招。一叫减负,把重复的、非主线的资料统一版本,能共享的学案全年级共用一份,订三套不如一套用透。二叫补己,每个组长写出本学科最薄弱的三个章节,年级组互相听评,评的是课不是人。三叫定时,集体备课固定在每周三下午最后两节,雷打不动,时间一挪,节奏就散了。

二、见底:讲过,不等于学会

(一)“听”过不算,听懂才算过关

讲过了不等于学会了,这是要见的第二处。学生听得认真、点头频频是好事,可点头不等于听懂,全班都在点头,恰恰是最该警惕的时候。办法很朴素:讲完一道典型题,请一位学生站起来复述刚才的思路,哪里卡住,哪里就是没听懂。卡壳的同学不丢人,替他把这句接上,下一位心里就有底。

听懂不能停在耳朵里,要落到纸面上。每节课结束前留三分钟,让学生把刚才那段讲给同桌听,或用一张小题条,一句话写出条件、方法、结论。写不出来的就是没听懂名单,交给当天限时训练检验。值得推广的是:连续两次复述卡壳的同学,当天单独叫他,不等到下次大考才处理。反馈快一天,漏洞就少一层。

(二)“看”过不算,会做才算过关

看过也不算会。学生最容易有的错觉是眼熟,讲评时他跟着看了一遍,觉得这也会;题目一遮住答案,笔尖停在纸上写不下去。还有更隐蔽的:看的时候跟着老师的思路走,觉得顺畅,因为路上有人扶着,自己走一遍就知道哪一步要拐弯。这个错觉不点破,后半程会越复习越慌,看起来会的题越来越少。

破它只有一个办法:遮住答案,独立做。我要求每份讲评材料后面都跟一份空白的变式练习,课上刚讲完的题必须让学生合上材料重新做一遍,过程要留痕迹。当天练的卷当天收、当天改,改不动的当天过夜;改完把错的集中起来,做第二遍手。看一遍会做不算本事,合上材料还能做出来,才叫真会。

(三)“讲”过不算,讲清才算过关

第三个是讲过也不算,这一条主要是对老师自己讲的。老师讲过了就默认学生会了,这是最省事也最危险的想法。一道题,老师讲的是自己顺过一遍的思路,中间很多步骤跳过去了,学生却停在台阶上。办法就一个:讲完请一位学生当老师上台讲一遍。学生讲不下去、绕开的地方,正是老师没讲透的地方。

所以我建议,每个备课组讲题课上固定做一件事:留一道有代表性的错题,让学生上台讲第一遍,老师只坐在下面听,听完再补讲。我校上一届有个班,坚持让学生上台讲题一学期,到期末,前十名里有六个能条理清楚地把难题从头讲到尾,讲题成了他们整理知识的主渠道。讲题课不是补充,是主渠道。

三、兜底:三个动作,把漏洞一一补上

…………

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  1. CONNECT:[ UseTime:0.000708s ] mysql:host=172.18.0.4;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001055s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000509s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000355s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000629s ]
  6. SELECT * FROM `set` [ RunTime:0.000301s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000690s ]
  8. SELECT * FROM `article` WHERE `id` = 544569 LIMIT 1 [ RunTime:0.000344s ]
  9. UPDATE `article` SET `lasttime` = 1794353340 WHERE `id` = 544569 [ RunTime:0.001557s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000402s ]
  11. SELECT * FROM `article` WHERE `id` < 544569 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000431s ]
  12. SELECT * FROM `article` WHERE `id` > 544569 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000378s ]
  13. SELECT * FROM `article` WHERE `id` < 544569 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000546s ]
  14. SELECT * FROM `article` WHERE `id` < 544569 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000540s ]
  15. SELECT * FROM `article` WHERE `id` < 544569 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000607s ]
0.085613s