Introduction:
Memorizing formulas and concepts in the Civil Engineering optional subject can be challenging. However, by using mnemonics and memory techniques effectively, you can enhance your ability to recall and retain important information. Here are some strategies that can help you in this process.

1. Acronyms and Initialisms:
- Create acronyms or initialisms using the first letter of each formula or concept you want to remember.
- For example, if you want to remember the formulas for stress and strain in materials (σ = F/A and ε = ΔL/L), you can create the acronym "SAFE" where S represents stress and ε represents strain.
- Another example could be the initialism "CBT" representing the concepts of concrete, beams, and tension.

2. Visualization:
- Create mental images or visual representations of the formulas or concepts.
- For instance, if you want to remember the formula for calculating the moment of inertia (I = ∫r^2dm), visualize a spinning object with its mass distributed at different distances from the axis of rotation, emphasizing the r^2 factor.
- You can also use drawings, diagrams, or flowcharts to visually represent complex concepts and their relationships.

3. Method of Loci:
- Use the method of loci, also known as the memory palace technique.
- Associate each formula or concept with a specific location in a familiar environment, such as your home.
- As you mentally walk through the location, you can recall the corresponding formula or concept associated with each location.
- This technique leverages the brain's spatial memory and can be particularly effective for remembering multiple items in a specific order.

4. Chunking:
- Group related formulas or concepts together into meaningful chunks.
- Instead of trying to remember each formula individually, focus on understanding the underlying principles and how they relate to each other.
- By organizing information into meaningful groups, it becomes easier to remember and recall the formulas or concepts as a whole.

5. Mnemonic Sentences:
- Create mnemonic sentences where each word in the sentence represents a keyword or cue for a formula or concept.
- For example, to remember the formula for calculating the volume of a cylinder (V = πr^2h), create a sentence like "Very Precise Harry calculated the Volume using π, r, squared, and height".

Conclusion:
By utilizing these mnemonic and memory techniques, you can enhance your ability to remember formulas and concepts in the Civil Engineering optional subject. Experiment with different strategies and find the ones that work best for you. Regular practice and revision will reinforce your memory and improve your overall understanding of the subject.