Padikam lessons

ORIGINAL STUDY COMPANION PADIKAM CLASS 12 | COMMERCE / HUMANITIES / ELECTIVE Informatics Practices CBSE / NCERT core lessons | Academic year 2026-27 9 chapter lessons Quick explanations, core points, exam practice and chapter-specific notation in one consistent format. Padikam explanations are independently written. Official textbooks are used as the coverage map, chapter sequence and terminology reference. PADIKAM | CBSE NCERT CLASS 12 1

Contents 01 Pandas Series 02 Pandas DataFrames 03 CSV Import and Export 04 Data Visualization with Matplotlib 05 SQL Functions 06 SQL Queries, Grouping and Joins 07 Introduction to Computer Networks 08 Societal Impacts 09 Project and Practical Integration Study rhythm Read the quick explanation, recall the core points aloud, then answer the prompts without looking back. Use the official textbook links for full prescribed readings, activities and diagrams. Textbook and verification links

1. https://cbseacademic.nic.in/web_material/CurriculumMain27/SecPart2/Informatics_Practices_SecP2_2026-27.pdf
2. https://ncert.nic.in/textbook.php?leip1=0-7
3. https://cbseacademic.nic.in/new-resources-srsec.html PADIKAM | CBSE NCERT CLASS 12 2

CHAPTER 01 Pandas Series Quick understanding A Pandas Series is a one-dimensional labelled data structure built from arrays, dictionaries or scalar values. Core points Check your learning Labels need not match integer positions. Explain the central idea of Pandas Series in your own words. Vectorised operations align by index. Apply one idea from Pandas Series to a head, tail, selection and slicing support inspection. textbook-style example or source. Code pattern import pandas as pd s = pd.Series({"A": 72, "B": 88, "C": 91}) print(s[s >= 80]) One-line recall Labels need not match integer positions. PADIKAM | CBSE NCERT CLASS 12 3

CHAPTER 02 Pandas DataFrames Quick understanding A DataFrame stores labelled rows and columns and supports selection, iteration and structural change. Core points Check your learning Create DataFrames from dictionaries, records or Explain the central idea of Pandas files. DataFrames in your own words. loc uses labels; Boolean masks filter conditions. Apply one idea from Pandas DataFrames to a textbook-style example Add, delete and rename columns deliberately. or source. Code pattern df = pd.DataFrame({"Name": ["Asha", "Ravi"], "Mark": [91, 84]}) print(df.loc[df["Mark"] > 85, ["Name", "Mark"]]) One-line recall Create DataFrames from dictionaries, records or files. PADIKAM | CBSE NCERT CLASS 12 4

CHAPTER 03 CSV Import and Export Quick understanding CSV import and export connect DataFrames with portable tabular files while requiring attention to headers, indices and missing values. Core points Check your learning read_csv infers a table from text. Explain the central idea of CSV Import and Export in your own words. to_csv can include or omit the DataFrame index. Apply one idea from CSV Import and Check data types after import. Export to a textbook-style example or source. One-line recall read_csv infers a table from text. PADIKAM | CBSE NCERT CLASS 12 5

CHAPTER 04 Data Visualization with Matplotlib Quick understanding Charts reveal patterns when the chart type, scale, labels and legend match the question. Core points Check your learning Line plots show ordered change. Explain the central idea of Data Visualization with Matplotlib in your own Bar charts compare categories; histograms show words. distributions. Apply one idea from Data Visualization A decorative chart is not a substitute for readable with Matplotlib to a textbook-style evidence. example or source. Code pattern import matplotlib.pyplot as plt plt.bar(df["Name"], df["Mark"]) plt.ylabel("Mark") plt.show() One-line recall Line plots show ordered change. PADIKAM | CBSE NCERT CLASS 12 6

CHAPTER 05 SQL Functions Quick understanding SQL scalar functions transform each selected value, while aggregate functions summarise rows. Core points Check your learning Math functions include POWER, ROUND and MOD. Explain the central idea of SQL Functions in your own words. Text functions change case, extract and trim. Apply one idea from SQL Functions to a Date functions and aggregates require awareness of textbook-style example or source. DBMS syntax and NULL handling. Code pattern SELECT UPPER(Name), ROUND(Marks, 0) FROM Student; One-line recall Math functions include POWER, ROUND and MOD. PADIKAM | CBSE NCERT CLASS 12 7

CHAPTER 06 SQL Queries, Grouping and Joins Quick understanding Advanced SQL combines filtering, ordering, grouping and joins to answer multi-table questions. Core points Check your learning GROUP BY defines summary groups. Explain the central idea of SQL Queries, Grouping and Joins in your own words. HAVING applies conditions after aggregation. Apply one idea from SQL Queries, Equi-joins match related key values. Grouping and Joins to a textbook-style example or source. Code pattern SELECT D.Name, COUNT(*) AS Students FROM Department D JOIN Student S ON D.DeptId = S.DeptId GROUP BY D.Name; One-line recall GROUP BY defines summary groups. PADIKAM | CBSE NCERT CLASS 12 8

CHAPTER 07 Introduction to Computer Networks Quick understanding Computer networks support communication and resource sharing through devices, media, protocols and internet services. Core points Check your learning PAN, LAN, MAN and WAN describe coverage. Explain the central idea of Introduction to Computer Networks in your own words. MAC and IP addresses identify at different layers. Apply one idea from Introduction to Network security combines authentication, encryption Computer Networks to a textbook-style and safe use. example or source. One-line recall PAN, LAN, MAN and WAN describe coverage. PADIKAM | CBSE NCERT CLASS 12 9

CHAPTER 08 Societal Impacts Quick understanding Technology affects privacy, intellectual property, access, health, work and the environment. Core points Check your learning A digital footprint can be copied beyond its original Explain the central idea of Societal context. Impacts in your own words. Open-source licences grant permissions with Apply one idea from Societal Impacts to conditions. a textbook-style example or source. Gender and disability gaps can be reduced through inclusive design. One-line recall A digital footprint can be copied beyond its original context. PADIKAM | CBSE NCERT CLASS 12 10

CHAPTER 09 Project and Practical Integration Quick understanding A good IP project uses Pandas, visualisation and SQL to answer a clear data question with reproducible steps. Core points Check your learning Document data source and cleaning decisions. Explain the central idea of Project and Practical Integration in your own words. Use charts that directly support the conclusion. Apply one idea from Project and Protect personal data and cite borrowed material. Practical Integration to a textbook-style example or source. One-line recall Document data source and cleaning decisions. PADIKAM | CBSE NCERT CLASS 12 11