Here are more than 50 Microsoft Excel commands and shortcuts that are commonly used and can be helpful in an exam-oriented context:

Basic Navigation and Selection:

• Move to the next cell: Tab or →
• Move to the previous cell: Shift + Tab or ←
• Move to the next worksheet: Ctrl + Page Down
• Move to the previous worksheet: Ctrl + Page Up
• Select the entire row: Shift + Space
• Select the entire column: Ctrl + Space
• Select the entire worksheet: Ctrl + A
• Select a range of cells: Click and drag, or Shift + Arrow keys
• Extend the selection: Shift + Arrow keys

Editing and Formatting:

• Cut: Ctrl + X
• Copy: Ctrl + C
• Paste: Ctrl + V
• Undo: Ctrl + Z
• Redo: Ctrl + Y or Ctrl + Shift + Z
• Bold: Ctrl + B
• Italic: Ctrl + I
• Underline: Ctrl + U
• Open Format Cells dialog: Ctrl + 1
• Fill Down: Ctrl + D
• Fill Right: Ctrl + R
• Insert current date: Ctrl + ;
• Insert current time: Ctrl + Shift + ;
• Wrap text: Alt + Enter
• AutoSum (Sum of selected cells): Alt + =
• Hide selected rows or columns: Ctrl + 9 (for rows), Ctrl + 0 (for columns)
• Show hidden rows or columns: Ctrl + Shift + ( (for rows), Ctrl + Shift + ) (for columns)

Formulas and Functions:

• Insert a function: Shift + F3
• AutoCalculate (sum, average, etc.): Alt + =
• Edit a cell's formula: F2
• Evaluate a formula: Alt + M, V, Enter (step through formula evaluation)
• Absolute cell reference ($A$1): F4
• Function arguments dialog: Ctrl + Shift + A
• Insert function (new formula): Shift + F3
• Name Manager: Ctrl + F3

Data Management:

• Sort ascending: Alt + A, S, A
• Sort descending: Alt + A, S, D
• Filter: Ctrl + Shift + L
• Remove filter: Alt + A, C
• Data validation: Alt + D, L (open Data Validation dialog)
• Text to Columns: Alt + D, E, F
• Find: Ctrl + F
• Replace: Ctrl + H

Cell and Worksheet Management:

• Insert new worksheet: Shift + F11
• Delete current worksheet: Alt + E, L
• Hide/Unhide columns or rows: Ctrl + 8
• Group/Ungroup worksheets: Shift + F11 (group), Alt + Shift + - (ungroup)

View and Zoom:

• Zoom in: Ctrl + Scroll up or Ctrl + + (Plus key)
• Zoom out: Ctrl + Scroll down or Ctrl + - (Minus key)
• Full-screen mode: Ctrl + Shift + F1
• Split worksheet: Alt + W, S (To split or remove split)

Please note that Excel shortcuts may vary depending on the version of Excel so read carefully before answering the question.